Thanks @Quad! It is nice to know what solutions people choose

bgfx is in my list of futuribles already. I got a bit scared of the lack of documentation and active communities on the theme but I did not rule it out. Your words encourage me to try it again. I actually put some blind trust in the tools that come from the GNOME environment but I need a better knowledge base to be able to make them work properly. Same happens with ClanLib, my other alternative. Regarding UI, I tried GTK+ and Qt and both are very good libraries but decided to fit to ImGui which I am starting to know in depth. Regarding sound and other needs, I did not really search. I saw Assimp as the only selection of everybody on mesh importing, and stb_* libraries are in my list of must to check. I saw entity component systems are widely used and I will probably end using one at some point.

Salud!