ThinkComposer is described as 'Create deep visual documents, adaptable and multi-level diagrams, flowcharts, concept maps, mind maps and models' and is an app in the Office & Productivity category. There are more than 100 alternatives to ThinkComposer for a variety of platforms, including Mac, Windows, Online / Web-based, 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 Google Keep. Other great apps like ThinkComposer are Microsoft OneNote (Freemium), Evernote (Freemium), Simplenote (Free, Open Source) and CherryTree (Free, Open Source).
Drafts, where text starts. Quickly capture text and send it almost anywhere! Drafts lets you turn text into action – it’s a quick notebook, handy editor, and writing automation tool, all in one. Open it and write right away, and create.
Notebook PEAs - encryption of notes. Protects your private notes with a password. The text is never stored unencrypted on your disk (until you explicitly decide to do that). The used cryptographic primitives are currently considered as safe as possible.