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couchers
The next-generation couch surfing platform. Free forever. Community‑led. Non‑profit. Modern. Chuck us a star :)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Also, I would suggest joining a hospitality org. The best, original one is Servas - www.servas.org - but there's couchers.org, trustroots.org and others. it could help you immensely.
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.