free-for-dev hit 459 votes today. A list of SaaS, PaaS and IaaS offerings that have free tiers of interest to devops and infradev.
I haven't used it. But here's what catches my eye: it showed up in the GitHub rankings organically, which means enough people found it useful to vote for it. That's a signal. Not a guarantee — but a signal.
My rule: don't chase every trending tool. Pick the 2-3 that solve a problem you actually have, try them for a week, and keep the one that works. Everything else is noise.