SylFilter is a generic message filter library and command-line tools. It provides a bayesian filter which is very popular as an algorithm for spam filtering. SylFilter also supports multilingual and can be applied to any languages. It is implemented with C language and runs fast with small resources.

- Very lightweight and fast - Provides learning-type junk filter - Easy-to-use command line tool - Multilingual support (including CJKV) - Supports several embedded databases (SQLite and QDBM)