Birdly - Birdly is an expense management and expense report solution for SMBs.
i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Siftery Track - Effortlessly visualize & optimize your team's software spend
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.
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.
awesome - A dynamic window manager for the X Window System developed in the C and Lua programming languages.