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 NoteLedge (Freemium).
Quiver is a notebook built for programmers. It lets you easily mix text, code and Markdown within one note, edit code with an awesome code editor, live preview Markdown and LaTeX cells, and find any note instantly via the full-text search.
PNotes (Pinned Notes or Portable Notes, use what you prefer) is written entirely in C and Windows API (with Pelles C for Windows IDE) - so it is fast and light-weight. It has flexible settings - both for the program in whole and for individual note.