diff --git a/cf-lib/changelog.txt b/cf-lib/changelog.txt
index c6224f2..ae8b83d 100644
--- a/cf-lib/changelog.txt
+++ b/cf-lib/changelog.txt
@@ -1,4 +1,57 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.0.14
+Date: 10.06.2025
+  Changes:
+    Add :merge
+---------------------------------------------------------------------------------------------------
+Version: 0.0.13
+Date: 23.05.2025
+  Changes:
+    Add Item class
+---------------------------------------------------------------------------------------------------
+Version: 0.0.12
+Date: 06.04.2025
+  Changes:
+    Add table.count
+---------------------------------------------------------------------------------------------------
+Version: 0.0.11
+Date: 28.03.2025
+  Changes:
+    - Add Technology:setIngredients
+---------------------------------------------------------------------------------------------------
+Version: 0.0.10
+Date: 16.03.2025
+  Changes:
+    - Recipe: addIngredient amount defaults to 1
+    - Functions are chainable
+---------------------------------------------------------------------------------------------------
+Version: 0.0.9
+Date: 28.02.2025
+  Bug Fixes:
+    - Rename `table.concat` to `table.concatTables` to resolve conflict
+---------------------------------------------------------------------------------------------------
+Version: 0.0.8
+Date: 28.02.2025
+  Changes:
+    - Add table.trim
+---------------------------------------------------------------------------------------------------
+Version: 0.0.7
+Date: 26.02.2025
+  Changes:
+    - Add table.concat
+  Bug Fixes:
+    - Bugfix in Recipe
+---------------------------------------------------------------------------------------------------
+Version: 0.0.6
+Date: 15.02.2025
+  Bug Fixes:
+    - Bugfix in table.removeValue
+---------------------------------------------------------------------------------------------------
+Version: 0.0.5
+Date: 15.02.2025
+  Changes:
+    - Add Recipe class
+---------------------------------------------------------------------------------------------------
 Version: 0.0.4
 Date: 13.02.2025
   Changes:
diff --git a/cf-lib/data/Item.lua b/cf-lib/data/Item.lua
new file mode 100644
index 0000000..1cfffcf
--- /dev/null
+++ b/cf-lib/data/Item.lua
@@ -0,0 +1,60 @@
+--- Utility class for a single item
+--- @class Item
+local Item = {}
+
+--- Pass an item name or an item table to get a Item object
+--- @param value string|table The name of the item or the item table
+function Item:new(value)
+    local name
+    local item
+
+    if type(value) == "string" then
+        name = value
+        item = data.raw.item[name]
+        if not item then
+            log("Item not found: " .. name)
+            return nil
+        end
+    elseif type(value) == "table" then
+        name = value.name
+        item = value
+    end
+
+    local obj = {
+        prototype = item
+    }
+
+    setmetatable(obj, self)
+    self.__index = self
+    return obj
+end
+
+--- Applies the item to the game
+function Item:apply()
+    data:extend({ self.prototype })
+end
+
+--- Assigns data to the item
+--- Shorthand for table.assign(item.prototype, data)
+--- @param data table The data to assign
+function Item:assign(data)
+    table.assign(self.prototype, data)
+    return self
+end
+
+--- Deeply merges data with the item
+--- Shorthand for table.merge(item.prototype, data)
+--- @param data table The data to merge
+function Item:merge(data)
+    table.merge(self.prototype, data)
+    return self
+end
+
+--- Sets the weight of the item calculated from given count per rocket.
+--- @param count number The amount of items that fit into a rocket
+function Item:itemsPerRocket(count)
+    self.prototype.weight = (1000 / count) * kg
+    return self
+end
+
+return Item
\ No newline at end of file
diff --git a/cf-lib/data/Recipe.lua b/cf-lib/data/Recipe.lua
new file mode 100644
index 0000000..6eca2b6
--- /dev/null
+++ b/cf-lib/data/Recipe.lua
@@ -0,0 +1,167 @@
+--- Utility class for a single recipe
+--- @class Recipe
+local Recipe = {}
+
+--- Pass a recipe name or a recipe table to get a Recipe object
+--- @param value string|table The name of the recipe or the recipe table
+function Recipe:new(value)
+    local name
+    local recipe
+
+    if type(value) == "string" then
+        name = value
+        recipe = data.raw.recipe[name]
+        if not recipe then
+            log("Recipe not found: " .. name)
+            return nil
+        end
+    elseif type(value) == "table" then
+        name = value.name
+        recipe = value
+    end
+
+    local obj = {
+        prototype = recipe
+    }
+
+    setmetatable(obj, self)
+    self.__index = self
+    return obj
+end
+
+--- Applies the recipe to the game
+function Recipe:apply()
+    data:extend({ self.prototype })
+end
+
+--- Assigns data to the recipe
+--- Shorthand for table.assign(recipe.prototype, data)
+--- @param data table The data to assign
+function Recipe:assign(data)
+    table.assign(self.prototype, data)
+    return self
+end
+
+--- Deeply merges data with the recipe
+--- Shorthand for table.merge(recipe.prototype, data)
+--- @param data table The data to merge
+function Recipe:merge(data)
+    table.merge(self.prototype, data)
+    return self
+end
+
+--- Adds an ingredient to the recipe
+--- @param ingredientName string The name of the ingredient
+--- @param amount number The amount of the ingredient (default: 1)
+function Recipe:addIngredient(ingredientName, amount)
+    amount = amount or 1
+    local ingredientType = data.raw.item[ingredientName] and "item"
+        or data.raw.module[ingredientName] and "item"
+        or data.raw.fluid[ingredientName] and "fluid"
+        or nil
+    if not ingredientType then
+        log("Unknown ingredient: " .. ingredientName)
+        return
+    end
+    self.prototype.ingredients = self.prototype.ingredients or {}
+    for _, ingredient in pairs(self.prototype.ingredients) do
+        if ingredient.name == ingredientName then
+            ingredient.amount = amount
+            ingredient.amount_min = nil
+            ingredient.amount_max = nil
+            ingredient.probability = nil
+            return self
+        end
+    end
+    table.insert(self.prototype.ingredients, { name = ingredientName, amount = amount, type = ingredientType })
+    return self
+end
+
+--- Replaces an existing ingredient by name with a new ingredient or adjusts the amount
+--- @param old string The name of the existing ingredient
+--- @param new? string The name of the new ingredient
+--- @param amount? number The amount of the new ingredient
+function Recipe:replaceIngredient(old, new, amount)
+    if type(new) == "number" then
+        amount = new
+        new = old
+    end
+    if self.prototype.ingredients then
+        for _, result in pairs(self.prototype.ingredients) do
+            if result.name == old then
+                result.name = new
+                result.amount = amount or result.amount
+                return self
+            end
+        end
+    end
+    return self
+end
+
+--- Removes an existing ingredient by name
+--- @param ingredientName string The name of the ingredient
+function Recipe:removeIngredient(ingredientName)
+    if self.prototype.ingredients then
+        for i, result in pairs(self.prototype.ingredients) do
+            if result.name == ingredientName then
+                self.prototype.ingredients[i] = nil
+                return self
+            end
+        end
+    end
+    return self
+end
+
+--- Replaces an existing result by name with a new result
+--- @param old string The name of the existing result
+--- @param new? string The name of the new result
+--- @param amount? number The amount of the new result (keeps the old value if not set)
+--- @param expensiveAmount? number The amount of the new result for the expensive recipe (uses amount if not set)
+function Recipe:replaceResult(old, new, amount, expensiveAmount)
+    if type(new) == "number" then
+        expensiveAmount = amount
+        amount = new
+        new = old
+    end
+    if self.prototype.results then
+        for _, result in pairs(self.prototype.results) do
+            if result.name == old then
+                result.name = new
+                result.amount = amount or result.amount
+            end
+        end
+        if table.main_product == old then
+            table.main_product = new
+        end
+    end
+    return self
+end
+
+--- Adds the recipe to a technology
+--- @param technology string|table The name of the technology or the technology table
+function Recipe:unlockedByTechnology(technology)
+    if not technology then
+        return
+    end
+    technology = type(technology) == "table" and technology or data.raw.technology[technology]
+    if (not technology.effects) then
+        technology.effects = {}
+    end
+    for _, effect in pairs(technology.effects) do
+        if effect.type == "unlock-recipe" and effect.recipe == self.prototype.name then
+           return self
+        end
+    end
+    table.insert(technology.effects, { type = "unlock-recipe", recipe = self.prototype.name })
+    return self
+end
+
+--- Clones the recipe
+--- @param name string The name of the new recipe
+function Recipe:clone(name)
+    local clone = table.deepcopy(self.prototype)
+    clone.name = name
+    return Recipe:new(clone)
+end
+
+return Recipe
diff --git a/cf-lib/data/Technology.lua b/cf-lib/data/Technology.lua
index 88b947f..13a1dd9 100644
--- a/cf-lib/data/Technology.lua
+++ b/cf-lib/data/Technology.lua
@@ -47,32 +47,46 @@ end
 --- @param data table The data to assign
 function Technology:assign(data)
     table.assign(self.prototype, data)
+    return self
+end
+
+--- Deeply merges data with the technology
+--- Shorthand for table.merge(technology.prototype, data)
+--- @param data table The data to merge
+function Technology:merge(data)
+    table.merge(self.prototype, data)
+    return self
 end
 
 --- Sets the prerequisite for the technology
 --- @param prerequisites table The names of the prerequisites
 function Technology:setPrerequisites(prerequisites)
     self.prototype.prerequisites = prerequisites
+    return self
 end
 
 --- Adds a prerequisite to the technology
 --- @param prerequisite string|table The name of the prerequisite or the prerequisite Technology instance
 function Technology:addPrerequisite(prerequisite)
     local _prerequisite = prerequisiteName(prerequisite)
+    self.prototype.prerequisites = self.prototype.prerequisites or {}
     if (not table.contains(self.prototype.prerequisites, _prerequisite)) then
         table.insert(self.prototype.prerequisites, _prerequisite)
     end
+    return self
 end
 
 --- Adds multiple prerequisites to the technology
 --- @param prerequisites table The names of the prerequisite or the prerequisite Technology instances
 function Technology:addPrerequisites(prerequisites)
+    self.prototype.prerequisites = self.prototype.prerequisites or {}
     for _, prerequisite in pairs(prerequisites) do
         local _prerequisite = prerequisiteName(prerequisite)
         if (not table.contains(self.prototype.prerequisites, _prerequisite)) then
             table.insert(self.prototype.prerequisites, _prerequisite)
         end
     end
+    return self
 end
 
 --- Replaces a prerequisite in a technology
@@ -86,6 +100,7 @@ function Technology:replacePrerequisite(old, new)
             self.prototype.prerequisites[i] = _new
         end
     end
+    return self
 end
 
 --- Removes a prerequisite from the technology
@@ -95,9 +110,10 @@ function Technology:removePrerequisite(prerequisite)
     for i, techPrerequisite in pairs(self.prototype.prerequisites) do
         if techPrerequisite == _prerequisite then
             table.remove(self.prototype.prerequisites, i)
-            return
+            return self
         end
     end
+    return self
 end
 
 --- Adds an ingredient to the technology
@@ -107,6 +123,7 @@ function Technology:addIngredient(ingredientName, amount)
     self.prototype.unit = self.prototype.unit or { ingredients = {} }
     self.prototype.unit.ingredients = self.prototype.unit.ingredients or {}
     table.insert(self.prototype.unit.ingredients, { ingredientName, amount or 1 })
+    return self
 end
 
 --- Adds a list of ingredients to the technology with the default amount of 1
@@ -115,6 +132,7 @@ function Technology:addIngredients(ingredientNames)
     for _, ingredientName in pairs(ingredientNames) do
         self:addIngredient(ingredientName)
     end
+    return self
 end
 
 --- Removes an existing ingredient by name
@@ -127,6 +145,16 @@ function Technology:removeIngredient(ingredientName)
             end
         end
     end
+    return self
+end
+
+--- Sets the ingredients for the technology
+--- @param ingredientNames table The names of the ingredients
+function Technology:setIngredients(ingredients)
+    self.prototype.unit = self.prototype.unit or {}
+    self.prototype.unit.ingredients = {}
+    self:addIngredients(ingredients)
+    return self
 end
 
 --- Adds a recipe unlock to the technology
@@ -134,16 +162,18 @@ end
 function Technology:addRecipe(recipeName)
     for _, effect in pairs(self.prototype.effects) do
         if effect.type == "unlock-recipe" and effect.recipe == recipeName then
-            return
+            return self
         end
     end
     table.insert(self.prototype.effects, { type = "unlock-recipe", recipe = recipeName })
+    return self
 end
 
 --- Adds an effect to the technology
 --- @param effect table The effect to add
 function Technology:addEffect(effect)
     table.insert(self.prototype.effects, effect)
+    return self
 end
 
 --- Removes a recipe unlock from the technology
@@ -152,9 +182,10 @@ function Technology:removeRecipe(recipeName)
     for i, effect in pairs(self.prototype.effects) do
         if effect.type == "unlock-recipe" and effect.recipe == recipeName then
             table.remove(self.prototype.effects, i)
-            return
+            return self
         end
     end
+    return self
 end
 
 --- Clones the technology
diff --git a/cf-lib/info.json b/cf-lib/info.json
index 088a838..c22dbfa 100644
--- a/cf-lib/info.json
+++ b/cf-lib/info.json
@@ -1,6 +1,6 @@
 {
    "name": "cf-lib",
-   "version": "0.0.4",
+   "version": "0.0.14",
    "title": "cackling fiends library",
    "description": "Because I'd like to have my own library :-)",
    "author": "cackling fiend",
diff --git a/cf-lib/util/table.lua b/cf-lib/util/table.lua
index 1cdfc11..865d683 100644
--- a/cf-lib/util/table.lua
+++ b/cf-lib/util/table.lua
@@ -46,7 +46,7 @@ end
 table.removeValue = function(target, value)
     for i, v in ipairs(target) do
         if v == value then
-            target.remove(target, i)
+            table.remove(target, i)
             return target
         end
     end
@@ -68,4 +68,39 @@ function table.filter(target, predicate)
         end
     end
     return result
+end
+
+--- Concatenates two tables into a new table.
+--- @param table1 table The first table
+--- @param table2 table The second table
+--- @return table The concatenated table
+function table.concatTables(table1, table2)
+    local result = {}
+    for _, v in pairs(table1) do
+        table.insert(result, v)
+    end
+    for _, v in pairs(table2) do
+        table.insert(result, v)
+    end
+    return result
+end
+
+--- Trims nil values from a table.
+--- @param target table The table to trim
+--- @return table The trimmed table
+function table.trim(target)
+    return table.filter(target, function(v)
+        return v ~= nil
+    end)
+end
+
+--- Counts the entries of given table.
+--- @param target table Table to count
+--- @return number Amount of entries
+function table.count(target)
+    local count = 0
+    for _ in pairs(target) do
+        count = count + 1
+    end
+    return count
 end
\ No newline at end of file