MathJax - MathJax is a cross-browser JavaScript library that displays mathematical notation in web browsers.

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.

AsciiMath - Easy-to-write markup language and JavaScript display engine for mathematics

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

X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.

OnlineNotepad.org - Free browser-based text editor