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.
Basefolder - Use your home PC as your own personal cloud storage server.
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.
CostStorage - Super simple cloud storage pricing estimator
Standard Notes - A safe place for your notes, thoughts, and life's work
Wallaroo Labs - An ultrafast and elastic data processing engine