ufdbGuard - URL filter for the Squid web proxy
Calmly Writer - Distraction-free text editor for Mac, Windows, Linux and ChromeOS.
E2Guardian - Web filtering solution
Writebox - Writebox is a simple and distraction-free text editor for Chrome and iPhone/iPad.
Diladele Web Safety - Diladele Web Safety is the name of a simple, easy to use and powerful web filter for all kind of activities over the internet.
Stashany - Online notepad for developers