VSCA stands for Versatile Sound Change Applier. It is a sound change applier written in Perl by MUBA. The program was initially asked for by board member and channel regular vohpenonomae, because he found that the SCAs available at that moment didn't fit his needs.
Noteworthy features include UTF-8 support, easy support for digraphs, trigraphs, and so on (called polygraph), easy and powerful variables/sound categories, easy support for geminate clusters, exceptions to rules, and optional characters.
See VSCA home for downloads, documentation, and more.