CloudSponge - Companies from every industry use CloudSponge’s Contact Picker to get access to their users’ address books.
Viral Loops - Viral Loops is a viral and referral marketing platform to launch ranking competitions, sweepstakes, pre-launch and referral programs.
SaaSiter Contacts Importer - Allow users to import contacts into their system.
Best Referral Programs - A curated directory of startup referral programs
OpenInviter - OpenInviter is a free import contacts (addressbook) script from email providers like Mail2World...
GrowSurf - Referral software for B2C, FinTech, and SaaS companies.