Accounting using command-line (accli) is a simple and extensible framework and toolkit for business managing for small companies and/or personal projects. It is written in Python and released under GPLv3.
On GNU/Linux:
$ apt-get install libpython3-dev virtualenv
$ virtualenv --python=/usr/bin/python3 accli
$ source accli/bin/activate
(accli) $ make develop
accli requires that your accounting information is store in YAML format. This is very useful since you can track the information using a VCS like git. See accli-repo for an example.