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roll20-character-sheets
Character sheet templates created by the community for use in Roll20 VTT. Submit a ticket at roll20.net/help if critical hotfixes are to be requested.
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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.
I've used roll20.net up until now. They have a find group feature and a virtual table top with character sheets and dice roller included, so everything you need to play virtually is all on the one site.
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Hence, a higher number means a more popular project.