just purchased a membership from digitavision.com a week ago (I got 15 tools for $17), but I can use only 10 of them, or something like that because the others are always down, not renewed or whatever.
Also, please note that the restrictions for some of these tools are very high, so you either can't add a project to track your rankings, or you don't have access to bulk / AI features, or whatever. Basically, you can only analyze a few keywords and a few sites per day, and that's about it. But all group buy services have these limitations, not just digitavision, so....
So far I am very pleased with Ahrefs, SEMRush, MoZ, Spin Rewriter, KWFinder (Mangools), StockUnlimited, Frase and a few others. But tools like Raven, SEO Profiler, or SpamZilla have never worked for me for various reasons (the premium accounts are not renewed, the sites are always down, etc.). But... to get access to Ahrefs, SEMRush, Moz and Spin Rewriter (without AI access, though) for $17 a month is a pretty good deal in my opinion, If you know what you're doing this cost will be recoverable before your next payment is due, so it's good deal.
