The best replacement for glfw is sdl.

The best alternatives to glfw are rated as following:
★★★★★  sdl
★★★★  glut
★★★  freeglut
★★★  sfml
★★★  glew
★  sdl 2

Your alternative for glfw is not listed? Suggest!
Speaking about glfw, one probably shouldn't forget about glew.

Other search terms related to glfw and their ratings are:
★★★★★ glew
You have in mind a companion for glfw and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of glfw in all years. Click on graph for more.
glfw
sdl
glut