Recommendations for (OSS) permitting systems?

Can anybody recommend an open-source permitting (i.e., "permit to work") system? I'm thinking along the lines for planned work on a large, multi-customer network.

Planned changes generally require a permit with a specified start and end time, which aligns with monitoring, changelogs, signoff, etc. We currently do this manually, but are looking into whether common tools exist. (It's a hard combination of words to google!)