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The only one I've used is Dashmap, it's a concurrent interior-mutability hashmap. Very convenient crate in the case you need that.
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SaaSHub
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Development seems to have stalled for some completed PRs and there's no current plan for crossbeam to support async
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There’s also im.
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Repo: concurrent (needs a new name)
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Since you asked, my little project in this area has been Syncbuf: https://github.com/bplevin36/syncbuf. It has 2 lock-free concurrent buffer types that are low-overhead by being append-only.
NOTE:
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Hence, a higher number means a more popular project.