Scripting and macros

Other languages:

Scripted objects: How to make 100% python-scripted objects in FreeCAD
Drawing Module: Automating the 3D-to-2D process
Line drawing function: How to build a simple tool to draw lines
PySide: Introduction to PySide and using it in FreeCAD
Dialog creation: How to construct dialogs with Qt designer, and use them in FreeCAD
Embedding FreeCAD: How to import FreeCAD as a python module in other applications
Macros recipes: Examples of macro scripts
Code snippets: Pieces of code to serve as ingredients in your scripts
Topological data scripting: Basic shape manipulation examples
Python Development Environment: A simplistic Development Environment for Python within FreeCAD

FreeCAD scripting: Python, Introduction to Python, Python scripting tutorial, FreeCAD Scripting Basics

Modules: Builtin modules, Units, Quantity
Workbenches: Workbench creation, Gui Commands, Commands, Installing more workbenches
Meshes and Parts: Mesh Scripting, Topological data scripting, Mesh to Part, PythonOCC

Parametric objects: Scripted objects, Viewproviders (Custom icon in tree view)
Scenegraph: Coin (Inventor) scenegraph, Pivy
Graphical interface: Interface creation, Interface creation completely in Python (1, 2, 3, 4, 5), PySide, PySide examples beginner, intermediate, advanced
Macros: Macros, How to install macros
Embedding: Embedding FreeCAD, Embedding FreeCADGui

Other: Expressions, Code snippets, Line drawing function, FreeCAD vector math library (deprecated)