What tool can you suggest to deal with A/B testing?

Hey folks! I want to know if you have any experience in some A/B testing tools. Can you recommend something?

I know about Optimizely, I've also heard a bit about Google Experiments and Microsoft Clarity. Do you know something else or which one should I use? I'm going to use for my personal project, so, if some of the tool provide FREE option and A/B testing, it'll be great, but even if it's paid, let me know what you think I could use.