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Scout Monitoring
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Wappalyzer https://www.wappalyzer.com: This one started as a chrome extension, then grew into a one-person million dollar business, the owner makes money by selling data to business associates.
Sidekiq https://sidekiq.org/: This one started as an open source project, once it got enough traction, the developer made a premium version of it, and makes money by selling licenses to businesses.
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.