Smalpest is written and maintained by jonsykkel (WOT: jonsykkel) and implements a large subset of the current spec. Smalpest is written in C and stores data directly on the filesystem. Smalpest is a work in progress and is updated somewhat regularly. For more detailed information, please see zzz.st/progz. There also exist channel logs for the proto-pestnet if you are interested in following along, although due to the not 100% reliability of the network and logger the main discussion around Pest development is happening in #asciilifeform on dulapnet1 (mirror).