Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
WhosCall - WhosCall is a reliable caller ID app whose popularity has led to its adoption by many users including international media. You can now manage the numbers calling you regardless of whether they are part of your contact list or not... read more.
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.