NoteAway - NoteAway is the simplest, most convenient way to take quick notes on OS X.

Speechy - Speechy is an app by Twelve Stars Software that comes up with features to help you in reading text in a variety of different formats such as pdf, txt, EPUB, webpages, and many others.

TakeNote - A web-based note-taking app with GitHub sync and Markdown support.

FLOOX - FLOOX app allows you to select a book from the internal storage to listen to it in the audio version by selecting the desired text-to-speech settings.

ReadEra - Read book files in EPUB, PDF, DOC, DOCX, RTF, TXT, DJVU, FB2, MOBI and CHM formats.

OnlineNotepad.org - Free browser-based text editor