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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.
While waiting for it to be fixed, you can this page as an alternative: https://www.openstreetmap.org/#map=6/52.241/2.219 While not as user friendly as terrain.party, it worked well enough for me.
What error do you get? I know it is working for few people 1 2.
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.