Delphinus Notes is described as 'freeware program designed to keep and manage notes. It contains simple notepad, calendar (with week schedule) and expenditure management module. All data can be encrypted and program can be protected by the password' and is a Note-taking Tool in the Office & Productivity category. There are more than 100 alternatives to Delphinus Notes for a variety of platforms, including Windows, Mac, Android, iPhone and Linux. 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 Delphinus Notes are Evernote (Freemium), Simplenote (Free, Open Source), CherryTree (Free, Open Source) and Zim (Free, Open Source).
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.
Todoist is a task manager thats useful, fast and easy to use. Accomplish more, every day. Millions of people rely on Todoist to get things done. Todoist lets you manage your tasks anywhere. At home. At school. At work. Online. Offline. And on 13 platforms and devices.