There are util libraries for and with LWJGL3, these include:
- for math you have
JOML (as mentioned above already)
- for loading images LWJGL3 has the
STBImage bindings which can load JPEG, PNG, TGA, BMP, PSD, GIF, HDR, PIC & PNM formats.
- for loading sounds LWJGL3 has the
STBVorbis bindings which can load Ogg files
- for loading and displaying fonts LWJGL3 has the
STBEasyFont and STBTruetype bindings which support the ttf font format
- for loading various 3d models you can use
jassimp.
- for 2d vector graphics LWJGL3 now also comes with bindings for
NanoVG.
- for 2d physics you can use
Jbox2d.
That should have you mostly covered or did you have some other utilities in mind?