Blogtrottr - Track RSS feeds and send updates to your email inbox.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Newspipe - Newspipe is a web news aggregator and reader.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Mailbrew - Automated email digests from Twitter, Reddit, YouTube & more
Bigtent - BigTent is a web-based organization and communication portal for groups.