Luiz Henrique de Figueiredo Software

Lua Lua
A scripting language developed with a team at PUC-Rio. In 1997, the first journal paper on Lua was awarded the first prize (technological category) in the II Compaq Award for Research and Development in Computer Science. This award was a joint venture of Compaq Computer in Brazil, the Brazilian Ministry of Science and Technology, and the Brazilian Academy of Sciences. In 2007, Lua featured in HOPL III, the Third ACM SIGPLAN History of Programming Languages Conference. Lua won the Front Line Award 2011 from Game Developers Magazine in the category Programming Tools.

Lua libraries and tools
I've also written several libraries and tools for Lua.

bs
A simple, programmable button shell for X11. I found it very useful and used it every day in the past. Also available at the official X repository and its mirrors in contrib/desktop_managers/. I wrote an article about it in The X Advisor (now defunct). Read a local copy instead, or a revised version that I wrote for The Motif Developer (also now defunct).

cflow
A clone of the Unix utility for generating call graphs, written for the Free Software Foundation and the GNU effort. (Somehow, it never made it into the official GNU distribution.) It includes a front end for C programs and a generic back end.

matt
A simple script to send attached files from the command line.