Sofu is a simple Unicode-based plain text file format designed for easily accessing and storing application data, such as game databases and configuration files. This project also hosts various Sofu parser libraries.
EntAgent is a tool for map-makers who map for source-engine based games (HL2, etc...).
EntAgent allows you to edit entity info(keys, outputs) with a text editor, so that you don't have to use the cumbersome hammer entity dialog.