Tonight I'm opening, in very limited capacity (50 slots), a web-player that's been in the works for the past several months called Thumper. You can sign up at www.thumpertv.com.
The goal of Thumper is to make setting up IPTV as painless as possible while keeping the usual look that you're accustomed to on a traditional STB. There are no hardware specific requirements. The only requirement is a web browser and keyboard.
Thumper currently only supports HLS streams, but if you supply it with a MPEG-TS source it will change the extension and attempt to load a HLS version. Usually sources follow the same URL scheme so you might get lucky and have it work for you.
In the future I plan on making tutorials on how to use the auto-login functionality in combination with auto-launching a browser in kiosk mode to the login link. This will allow you to run an IPTV box with nothing more than a regular operating system. I've extensively tested this with chrome and kubuntu and it works great.
Please send any suggestions for features or bugs/issues to our subreddit at r/thumpertv.
Keep in mind that we are only a media player, we are NOT a streaming service.