The core features of FreeBASIC.

Keywords - Alphabetical
Keywords - Functional
Graphics Keywords
Operators List

Variables and Data Types
Operators
Statements
Other

Procedures and macros that are a part of the FreeBASIC run-time library.

Array Functions
Bit Manipulation
Console Functions
Date and Time Functions
Error Handling Functions
File IO Functions
Mathematical Functions
Memory Functions
Operating System Functions
String Functions
Threading Support Functions
User Input Functions

Procedures and macros that are a part of the FreeBASIC graphics library.

2D Drawing Functions
User Input Functions
Screen Functions

Keyboard Scan Codes
Default Palettes

How to write programs in FreeBASIC.

Programmer's Guide
Community Tutorials
Community Code Library

The FreeBASIC compiler is a command line tool that generates executables from FreeBASIC source code. It doesn't come with a source code editor. Still, IDEs specifically for FreeBASIC are available, aswell as FreeBASIC support in many other IDEs and code editors.

Installing FreeBASIC | Requirements
Running FreeBASIC
Using the Command Line | Command Line Options

Debugging with FreeBASIC

Compiler Error Messages
Tools used by fbc

FreeBASIC and Qbasic | Differences from QB
FreeBASIC Dialects

Compiler FAQ
Graphics Library FAQ
Run-Time Library FAQ
Xbox port FAQ
DOS related FAQ
Windows related FAQ
Linux related FAQ

Obsoleted Keywords
Glossary
Miscellaneous Keywords
C Standard Library Functions
Library Headers Index
ASCII Character Codes
Runtime Error Codes