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.
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.
The Mknew Project is an investigation of how to build simple Unix shell scripts to manage common development and administrative tasks. The emphasis is on using languages and tools that already exist and are in common use. A related emphasis is on exploring the functional programming nature of the bash shell. This is accomplished by using the bash function capability, and using the bash "$(" ")"syntax to delay function execution in bash scripts. This allows building scripts that have a LISP-like function syntax that permits shell scripts to be written as a series of function calls with minimal syntax. The goal is to provide a way to specify make procedures of heterogeneous components in a bash script. These can include diverse source code languages, documentation text, test procedures, and data. In addition to the mknew function library (mklib), these "make" procedures rely only on capabilities provided by the bash shell, and common Unix command line utilities.