AddThis - AddThis free website tools include share buttons, targeting tools and content recommendations help you get more likes, shares and followers and keep them coming back.
Proof - Website conversion rate optimization and visitor monitoring
Sharingbuttons.io - Quickly generate social sharing buttons with a tiny performance footprint.
Nudgify - Nudgify is a Social Proof App that includes FOMO, Urgency and Review Nudges. Adding Social Proof notifications to your site helps you build trust and increase conversions on Shopify, Wordpress or any other platform.
AddToAny - Share buttons by AddToAny, the universal sharing platform for websites and apps.
Fomo - Fomo turns your site into the online equivalent of a busy store