deawk is a very simple double-entry bookkeeping system designed for self-employed people. It uses three (text) data files: transactions, a chart of accounts, and an optional vehicle log. Reports are generated by running bash scripts which run awk. deawk currently does not support depreciation of capital assets.
Cinabox (Continuous Integration in a Box) automates the setup of a Continuous Integration (CI) system by doing The Simplest Thing That Could Possibly Work. It consists of two simple scripts to set up a cruisecontrolrb CI server from scratch on an Ubuntu 8.04 system: one script to bootstrap Ruby, and another script to set up CI.
Spack is a standalone package manager with its own CPIO-based package format but aiming to keep total compatibility with Slackware Linux. Written in POSIX shell as much as it makes sense, it attempts to provide a fairly complete toolkit to build, install, remove, list, retrieve, and arrange your packages. It can be used as an alternative to Slackware's pkgtools, just to independently and properly manage your local software on any distribution, or as the main package manager of the distribution you build yourself.