Culture Amp - Culture Amp makes it easy to collect, understand and act on employee feedback. Improve the engagement, experience and effectiveness of every employee - all from one platform.
RedNotebook - RedNotebook is a software that format, tag and search entries and add pictures, links and customizable templates, spell check notes, and export to plain text, HTML, Latex or PDF.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
MemPad - MemPad is a plain text outliner and note taking program with a structured index.
Nextcloud Tasks - A tasks app for Nextcloud.
Lifeograph - Lifeograph is an off-line and private journal and note taking application.