Ask.fm - Curious? Just ask! Openly or anonymously.
Lipsi - This app is an often used app as an alternative for Sarahah.
Retrospring - Q/A based social network
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.
Confessout - Anonymous messaging web app.