Thanks! For now I have some benchmarks for parsing, as this has been my main focus regarding performance. It consistently ranks in the top 2 with the caveat that other libs do not support most of the feed namespaces that Feedsmith does.
I also use Inngest, Plausible and PostHog which are open source. Hard to find a decent alternative to S3 and even if you find one, they just use S3 under the hood so what's the point?
I run a website dedicated to gathering the best open-source companies. Recently, I analyzed the technologies each company uses. It was a challenging task, but I was able to identify nearly 250 different languages, frameworks, and development tools.
I've built https://openalternative.co a month ago, but it's pretty niched down to software/saas applications. I think a more general one for broader selection of open source software would also be nice to have.
The code for OpenAlternative is on GitHub if you want to use some or take inspiration.