ThoreauBASIC has just come up on Hacker News:
* https://news.ycombinator.com/item?id=49942103
Whilst the 'Phoenix Edition' above states that the old QB64 pages are off-line, in fact there do still seem to be some around today. I don't know what the history is here. Whatever it is, it seems to have been fixed.
* https://github.com/DualBrain/QB64
QB64 in turn points to PC-BASIC, a clone of the old GW-BASIC with at a quick glance nothing really modern going on: