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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.
Case in point -- an enhancement to PostgreSQL's connection pooler that could have been released as OSS with essentially no impact on RDS Postgres and yet: https://github.com/awslabs/pgbouncer-rr-patch/issues/3
Disclosure: I work at Sentry.
> My personal term for this sort of "We're OK with little people using the software but we don't want any competition"
Large companies are free to use Sentry. There are Fortune 50 companies running Sentry at scale internally without paying us a cent. That's totally cool.
You're also free to compete with Sentry. You're not free to repackage Sentry for the purposes of competing us. There are lots of competing error and performance monitoring products out there that do perfectly fine without it.
I should also note that many components of Sentry are distributed with OSI-approved licenses that you are free to use to compete with us. For example, our Symbolication service (https://github.com/getsentry/symbolicator) ships with an MIT license, and it's an important part of our business.