mastodon.world is one of the many independent Mastodon servers you can use to participate in the fediverse.
Generic Mastodon server for anyone to use.

Server stats:

12K
active users

Signal

It costs around $50 million every year to ensure Signal is robust and available all over the world for anyone whenever they need it.

And as a nonprofit, that money comes from all of you; the people who believe that we all deserve a place to speak freely.

signal.org/donate/

Signal MessengerDonate to Signal Private MessengerYour donation helps pay for the development, servers, and bandwidth of an app used by millions around the world for private and instantaneous communication. Please make a donation today.