PNotes is a desktop manager that is great for virtual note-taking. It is versatile, lightweight, and customizable. It is also very user-friendly and has many features that make note-taking easier. PNotes supports multiple languages, so you can easily switch between them depending on your needs. In addition to its language
Omni-Notes is an incredibly powerful open-source note-taking application for Android that is both smart and simple. It boasts a clean and simple Material Design interface and is packed with a plethora of smart features. These include image, audio, and generic file attachment, a To-do list, Google Now integration, numerous widgets,
TreeSheets is a free open-source data organizer. A "hierarchical spreadsheet" that is a great replacement for spreadsheets, mind mappers, outliners, PIMs, text editors and small databases. Suitable for any kind of data organization, such as todo lists, calendars, project management, brainstorming, organizing ideas, planning, requirements gathering, presentation of information, etc.
Features * Markdown-first. Also supports any plaintext and RTF files. * Fast and lightweight. Works smoothly with 10k+ files. * Access anywhere. Sync with iCloud Drive or Dropbox. * Multi-folder storage. * Keyboard-centric. nvalt-inspired controls and shortcuts. * Syntax highlighting within code blocks. Supports over 170 programming languages. * In-line image support. * Organize with tags. * Cross-note links