You've Got Spam - A new tool that lets you spam back the spammer
Clean SMS - Filters out spam SMS on your Android phone
Castle - The easiest way to protect your users from getting hacked
RoboStopper - Block spam calls or get paid for them wasting your time
Crypton.sh - SMS - Secure Anonymous SMS in the cloud (and a phone number)
CallHero - Win the battle against robocalls with call screening