A danbooru-style image board, designed to be easier to install, run, and extend.
Requires a standard LAMP stack as provided by any normal web host. It can also use PostgreSQL as a database, which is recommended for high-load sites.
This is probably my most popular project, with a team of 10 coders, hundreds of installations, and thousands of users online at once.
Shish's personal gallery, where new features are tested
A gallery for Katawa Shoujo fanart, with a very nice theme and some code modifications
An image dump for My Little Pony fans
The biggest known Shimmie installation, averaging 3000 users online at any time