Flow
Luke

A formspec library that automatically positions and sizes elements

Snippets
Luke

A way for admins to run and save Lua snippets.

Formspec AST
Luke

A library to help other mods interpret formspecs.

Flow Inspector
Luke

An "inspect element" helper for flow GUIs

flinv
Luke

API to add new inventory tabs which work across different inventory mods

FS51
Luke

Compatibility layer for formspecs

Verbana GUI
Luke

A GUI for verbana