It looks that I missed few base64 encoders, Moru (dead link?) and Marmor (
forum link) created some, I will check it, but as there are no issues with sending raw binary files not sure if I'll use it.
Generally GLBasic has some issues - mostly bugs/compatibility related, it's quite lightweight without ton of libs, on other hand you need to put all of this by yourself, and for most time it's overkill for small projects/visualizations/prototyping. In core there is nothing wrong, but just other tools and technologies evolved so much, for 2d specially JS and WebGL engines, for prototyping it's much faster - no recompile = instant preview, and that's crucial now days. If you have working mechanic and need speed GLB is a good solution in comparison to some other tools.
Some good tutorials would be helpful for possible new users, or maybe showcase with newer projects, being mentioned in such media as GamesFromScratch also would help gain some user base. But for that few thing probably should be fixed/changed.