BeeCanvas lives up to its name by enabling real-time collaboration on a whiteboard-style space. The goal of the app, to enable project collaboration while also maintaining easy accessibility via the web on desktops and via the App Store or Google Play on phones and tablets, is shared by other apps that can be found right here on AlternativeTo.
Writeaday is a novel journal app for the modern thinker. Integrates the power of streaks but in a visual color gradient form. There are hundreds of journaling apps out there - like, literally hundreds. We really think we have a novel concept for this old school genre.
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.
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.
NoteAway is the simplest, most convenient way to take quick notes on OS X. NoteAway has lots of powerful features for free, like iCloud syncing, rich text, attachments, simple import/export, and a variety of customizable options.