Squib was written by Matt Mower in 2005. Squib was written as a replacement for his blogging package Radio Userland and an urge to learn Rails. Since then it has gone through several partial rewrites as the Rails feature set developed.
Squib 0.3.6 was released on Dec 20th 2005. There was a 0.4 branch intended to support multiple weblogs that was eventually abandoned. Squib 0.5 is the current stable release and was released in 2006 containing a few fixes and improvements to the 0.3 release.