Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...

Anycomplete - The magic of Google Autocomplete while you're typing

TextMe - TextMe is a free calls and messaging application at both local and international levels.

Qikipedia - Instant Wikipedia summary cards on any web page

Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.

Newsit - Find the discussion around the page you're looking at!