Janus Notes 2 is described as 'Janus Notes is an open source note taking program for OSX that seriously respect your right to privacy. A companion app for iPhone and iPad allows you to have your notes always with you' and is a Note-taking Tool in the Office & Productivity category. There are more than 50 alternatives to Janus Notes 2 for a variety of platforms, including Windows, Mac, Android, iPhone and iPad. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Microsoft OneNote. Other great apps like Janus Notes 2 are Evernote (Freemium), Simplenote (Free, Open Source), CherryTree (Free, Open Source) and NoteLedge (Freemium).
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, can be copied, tagged and modified either from the applications directly or from your own text editor.
Notezilla is the leading sticky notes app for Windows, Android, iPhone/iPad and the web. Set reminders to sticky notes, Pin sticky notes, attach them to websites, docs & folders, sync between PCs and other devices, organize using folders and tags.