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Depending on your exact needs, you could try HashiCorp's Raft implementation: https://github.com/hashicorp/raft
https://github.com/vimeo/leaderelection (from my team at $WORK) — RaceDecier is the interface you implement on top of whatever transactional store you have. It comes with an "in-memory" one for testing and a Google Cloud Storage one (using a write with a generation-match precondition as the atomic op). There's also a legrpc subpackage that provides a gRPC resolver that consistently directs requests to the current leader.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.