Source: Below are my step-by-step notes based on the instructions found here: https://github.com/jaap-karssenberg/zim-wiki/wiki/Install-on-OS-X-using-Platypus
Zim is a desktop wiki app written in Python and GTK. Learn more at: http://zim-wiki.org/
On Macs, you normally run the app by calling:
python zim.py