We maintain a web based queue management software called SimplQ, that anyone can use to create instant queues to manage crowd with a smartphone.
We revamped our UI, and we have been getting a lot of collaborators thanks to #hacktoberfest
It's a straightforward React CRA app. We have a lot of easy to fix issues and have been merging lot of quality PRs:
Open Issues: https://github.com/SimplQ/simplQ-frontend/issues
You can see the site here: https://simplq.me/