P2P tools for developing decetralized services:

https://blockstack.org/
Blockstack is a new decentralized internet where users own their data and apps run locally. A browser portal is all that’s needed to get started.

https://ipfs.io/
A peer-to-peer hypermedia protocol
to make the web faster, safer, and more open.

http://matrix.org/
An open network for secure, decentralized communication.

https://lbry.io/
LBRY is a free, open, and community-run digital marketplace.

https://gnunet.org/
GNUnet is an alternative network stack for building secure, decentralized and privacy-preserving distributed applications. Our goal is to replace the old insecure Internet protocol stack. Starting from an application for secure publication of files, it has grown to include all kinds of basic protocol components and applications towards the creation of a GNU internet.

GNUnet is an official GNU package. GNUnet can be downloaded from GNU and the GNU mirrors.

@AMID_EVIL Reminds me - I need to post the design notes for Network 23 from a few years ago.

@AMID_EVIL Thank you very much for your excellent list. Here is another you may find interesting:

https://sandstorm.io/
Sandstorm makes it safe & easy to use indie web apps. It adds security hardening to protect your privacy. Apps never disappear, and you can add your own. Run your own server or use our hosting

Login and use their server for free or install your own. Just click to install a bunch of different things like https://apps.sandstorm.io/

They give you space for free

@gemlog
List could be tittle larger.

@AMID_EVIL I reposted and added a bit on a site I remember about twice a year, but I wanted it all in one place. I hope that's ok with you.

https://www.gemlog.ca/