Synology Note Station - Without needing to spend money on Evernote, Synology Note Station provides a desktop client to organize all your random notes in one place.

TagSpaces - TagSpaces is an open source platform for personal data management. With TagSpaces you can manage and organize the files on your laptop, tablet or smart phone.

UpNote - A beautiful and clean cross-platform app for notes organizer

Tabbles - Tabbles use tags to organize and find files along with your colleagues.

Note Board - Productivity app. Save information like a sticky notes.

allTags - allTags is a free, tag based file management application.