Yes, We have participated in three gitcoin grants round before  which were :
1. Gitcoin grant round 19 
2. Gitcoin grant round 20
3, Gitcoin grant round 21

You can easily find our stats and round participation details here : https://explorer.gitcoin.co/#/projects/0xafa569b3df50c6c51374bf2b214eb7c948cf3dce2a65c3f627bce0a2603cec72 