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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.
Definitely want to consider Corso if pricing is a big concern. Corso is free and open source, you provide your own S3-compliant storage. With only storage to pay for, you can be competitive with how you're offering it your clients. Here's a blog post by MSP Fonicom using Corso to great effect.
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.