Scmail is a mail filter written in Scheme, you can write processing recipes in S-expression. Scmail can be used as a filter for an incoming mail, invoked each time by .forward, or it can be used as a mail processor to distribute existing mails into the right mailbox. It comes with a bayesian spam filter called scbayes.

Preprocess is like a typical C preprocessor, but it extends to multiple languages. Languages for which it works include: C++, Python, Perl, Tcl, XML, JavaScript, CSS, IDL, TeX, Fortran, PHP, Java, Shell scripts (Bash, CSH, etc.) and C#.

PyMetrics produces metrics for Python programs. Metrics include McCabe's Cyclomatic Complexity metric, LoC, %Comments, etc. Users can also define their own metrics using data from PyMetrics. PyMetrics optionally outputs stdout, SQL command files and CSV

fzy is a fast, simple fuzzy text selector for the terminal with an advanced scoring algorithm.