Woof
You plug into a network and just want to exchange files with other participants.
Note: not really secure ! But very usefull.
Example
lparmentier@lparmentier-t460:~/tmp$ woof directory/
Now serving on http://192.168.17.71:8080/
192.168.17.71 - - [12/Oct/2017 16:08:04] "GET /directory.tar.gz HTTP/1.1" 200 -