There are multiple programs to make 'direct connections',
but for public gaming (with a list of online servers/rooms, to play not only with known friends), since Tunngle and Evolve have closed, currently only **pLan (.. OpenVpn)** and **gameRanger** are the options.

While GameRanger currently has disadvantages like games autostarting and -closing, rooms auto-locking, amount of players being limited to one ingame-server, and strict game selection,
pLan needs players a lot, please join us to play together.