Ask.fm - Curious? Just ask! Openly or anonymously.
Peing - Collect anonymous questions with SNS!
Whisper.sh - Whisper is the best place to express yourself online. Connect with likeminded individuals and discover the unseen world around you.
Tellonym - Tellonym is the most honest place on the internet.
Lipsi - This app is an often used app as an alternative for Sarahah.
Zaqa - Zaqa is a Question & Answer based social networking tool.