Self-hosting

There is a periodic meeting of linux users in my area where everyone brings laptops and connects to a LAN. Just wondering if I want to share files with them, what are decent options? Is FTP still the best option or has anything more interesting emerged in the past couple decades? Guess I would not want to maintain a webpage so web servers are nixed. It’s mainly so ppl can fetch linux ISO images and perhaps upload what they have as well.