Owellow

Hiya. I have some experience with various engines like this. I haven't been in the loop for a bit. I noticed that there are several different engine links. I also noticed that a couple of the links, along with the "official" download button, link to engines with downloads that are no longer available or not posted, etc. If someone wanted to get into tinkering with eclipse and making stuff today, what is their best option? Origins, worlds, customs, where are the most current links? Are any still being developed? I don't expect anyone to hold my hand, not what I'm looking for. Just wondering if there are any links available and which systems are still active. Thanks!