todoZero is described as 'combines your notes and to-dos in one place' and is an app in the Office & Productivity category. There are more than 100 alternatives to todoZero for a variety of platforms, including Windows, Mac, Online / Web-based, iPhone and Android. The best alternative is Joplin, which is both free and Open Source. Other great apps like todoZero are Standard Notes (Freemium, Open Source), Notion (Freemium), Google Keep (Free) and Microsoft OneNote (Freemium).
RightNote will help you get a grip on information overload. It is designed to be easy to use for the new-comer, but also provide advanced features once your notes start to accumulate. RightNote can store text notes, source code, spreadsheets and webpages.
Start writing your thoughts and memories and have them synced and backed up in the cloud. glimpses use Dropbox syncing capabilities to sync all your entries. It stores your data at Dropbox service. Just authorize with Dropbox and you're ready to go.
Tracks is a web-based application to help you implement David Allen’s Getting Things Done™ methodology. It was built using Ruby on Rails, and comes with a built-in webserver (WEBrick), so that you can run it on your own computer if you like.