Wult.io - Accessible self serve data governance
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
Team-One - Team-One is more than messaging; it’s teamwork made simple.
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
Getodo - colorful lightweight multi-level to-do list on Android, iOS, web.
Standard Notes - A safe place for your notes, thoughts, and life's work