Webmention.io - Webmention.io is a hosted service created to easily receive webmentions on any web page.
ViralContentBee - Viral Content Bee is a web-based platform that utilizes a crowd-sourcing model to facilitate the generation of “social buzz” on content.
Scuttlebutt - A decent(ralised) secure gossip platform.
RecurPost - RecurPost is a social media scheduler with repeating schedules. It allows you to schedule content on multiple social accounts from a single dashboard.
Bridgy - Bridgy pulls comments, likes, and reshares on social networks back to your web site. You can also use it to post to social networks - or comment, like, reshare, or even RSVP - from your own web site. https://brid.gy/
Elevate - Elevate is an award-winning brain training tool designed to build communication and analytical skills.