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Re:Ask HN: Which proprietary SaaS can be replaced with FOSS ... by superasn on Tuesday June 11, 2019 @10:44PM (#20161302)
I think a lot of popular services are just enhancements to open source tools like git, selenium, elasticsearch, etc.

But to answer your question selenium/puppeteer looks like a good tool for automatic website monitoring and testing.

Re:Ask HN: Which proprietary SaaS can be replaced with FOSS ... by tnolet on Thursday June 13, 2019 @07:19PM (#20179437)
Running Puppeteer for monitoring is 50% of the SaaS I run. You can totally run it in a cronjob. Getting it to behave predictably and consistently and delivering actionable results is a different thing though.
Re:Ask HN: Which proprietary SaaS can be replaced with FOSS ... by superasn on Saturday June 15, 2019 @03:02PM (#20191517)
Yes I think browserless.io is a very good site if you want to avoid those headaches with puppeteer.

But it may dilute your profits though since you'll need to buy a commercial license for it even though the project itself is open source. Depends on the money vs time you want to invest in doing it.