4chan 
public
free

telnet | netcat

https://en.wikipedia.org/wiki/File_sharing
	DC
	eDonkey
	FTP

https://en.wikipedia.org/wiki/Category:Internet_protocols
https://en.wikipedia.org/wiki/Lists_of_network_protocols
https://en.wikipedia.org/wiki/Finger_(protocol)
list of protocol intext:gemini -intitle:gemini