Here are 4 quakeworld servers where you can play for free.

Check the community !

3DLibre QW Antilag Server #1 >>> /connect 5.196.28.199:28501

3DLibre QW Antilag Server #2 >>> /connect 5.196.28.199:28502

3DLibre QW Antilag Server #3 >>> /connect 5.196.28.199:28503

3DLibre QW Antilag Server #4 FFA >>> /connect 5.196.28.199:28504

> more details here