md5chk is a tool for creating MD5 sums. It was designed so that its output would be easy to use with command line shells. It guarantees that the MD5 sum is always "clean" of characters that would be misinterpreted by the shell and that special characters in the file names are always properly escaped.
tunerlimit is a preload library that allows some fine-tuning of when calls to setrlimit(2) are allowed, and when they are "blocked". This can be useful in situations where, for example, SELinux policies cause programs to fail completely when making trivial or idempotent calls to setrlimit().
The Middleman System (mdm) is a set of utilities that help you parallelize your shell scripts. Its design is based on ideas from superscalar computer processors: it fetches commands as your script is running, detects potential interference between commands on the fly, and issues commands for execution in parallel as appropriate.
Secrond is a light-weight cron implementation that allows running of user-specified programs at periodic scheduled times, handling tasks in intervals of seconds rather than minutes, as well as hours and days. While it is possible to achieve similar behavior by using a traditional cron daemon and adding calls to sleep() to the programs executed, it is impractical.
libcsv_parser++ is a C++ library for parsing text files to extract records and fields. The records can be delimited with any set of characters. It makes the following assumptions: the record terminator is only one character in length; the field terminator is only one character in length; and the fields are enclosed by single characters, if any. The parser can handle documents where fields are always enclosed, not enclosed at all, or optionally enclosed. When fields are strictly all enclosed, there is an assumption that any enclosure characters within the field are escaped by placing a backslash in front of the enclosure character. The software could be ported to Windows with very little effort.