i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.

Expensify - Import expenses directly from a credit card to create free expense reports quickly. Approve reports online and reimburse directly to a checking account with one click.

dwm - dwm is a dynamic window manager for X. It manages windows in tiled, monocle and floating layouts. All of the layouts can be applied dynamically, optimising the environment for the application in use and the task performed.

Fyle - Track expenses across devices on-the-go and maintain a central repository. With custom approval flows, automatic policy violation detection and an automated audit trail, be audit-ready at all times!

Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.

Abacus - Expenses without the 'expense report'