"PFS is a new hypermedia distribution protocol, addressed by content and identities. IPFS enables the creation of completely distributed applications. It aims to make the web faster, safer, and more open.
IPFS is an open source project developed by the team at Interplanetary Networks and many contributors from the open source community."
Freenet is free software which lets you anonymously share files, browse and publish "freesites" (web sites accessible only through Freenet) and chat on forums, without fear of censorship. Freenet is decentralised to make it less vulnerable to attack, and if used in "darknet" mode, where users only connect to their friends, is very difficult to detect.
"The Obsidian Platform is a C# blockchain based on Stratis, with both Masternodes and Service Nodes. We have developed the Obsidian Secure Messenger (OSM) application, currently in public alpha testing."