Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
RealValidito - Phone Validator | Free Phone Number Validation & Phone Number Lookup Service | Realvalidito
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Numverify - Global phone number validation and lookup API
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
Clearout Phone - Phone Number Validation - Accuracy Guaranteed, GDPR Compliant, Abuse Phone Number Checker, Real-Time API 99.999% Uptime - Free Trial With 100 Credits!