Turtl - The secure, collaborative notebook
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Tomboy - Apps/Tomboy - GNOME Wiki!
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Carnet - Opensource rich text note taking app
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.