Flipper Zero firmware sources — official firmware source written in C language and licensed under GPL v3.
Flipper Build Tool (FBT) — all-in-one firmware development toolkit with Visual Studio Code support. Read FBT Documentation
Source code of Flipper Zero firmware packaged with build and debug toolkit (FBT)
Applications SDK
Micro Flipper Build Tool (uFBT) — toolkit for developing user applications for Flipper Zero
Micro Flipper Build Tool (uFBT) — all-in-one toolkit for developing your applications for Flipper Zero. It automatically download and install latest firmware headers, debug symbols and building toolchain. uFBT provides full Visual Studio Code integration.