I used to be a big fan of OmniWeb back in its day because it pushed the envelope in adding utility and emphasized its role as a powerful tool that put the user in control. It included things like per-page user CSS years before userstyles became popular in Firefox and Chrome.
It was paid however, and at least in that point in time there was little appetite for a paid browser, and so now it’s a hobby project that Omni Group devs occasionally tinker on and hasn’t been actively maintained in some time.