I'm gonna bend the premise a bit ....
Hardware wise, in th not gone but not in same markets as before, I'd say Mushkin Memory ... yes I know they still around but up thru DDR3, if you wanted the best performing memory, you religiously bought Mushkin. To a large extent, it's not bout what brand you bought as everybody had access to the same modules, but the redlines were always a step up above the pack and you could load the voltage up on those Redlines like crazy. With DDR3, when everyone had DDR3-2400 10-12-12-31, they had 10-12-12-28 .... Corsair and a few others had it for a while but soon after dropped to the cheaper -31 modules. I once asked a question from fellow users as was concerned about running at 1.70, and had responses from folks who were running years at 1.80 - 1.94v I never pushed that far but liked knowing the headroom was there. The aesthetics also avoided the flashy "look at me, look at me aesthetic". Now, since DDR4, they are still in the memory game but when ya do find top of the line CAS, almost can never find any.
Software wise ....
I miss Lotus Software Suite ... for someone who doesn't sit and use software suites all day, I found... and still find , it had the most intuitive setup of any suite we ever used. Back in 1990s, we'd write manuals for companies and setting up a complex document with pics, charts and tables was so much easier in LWP. We's draft everything in LWP and then convert it to whatever folks wanted (MS, Wordperfect, whatever). One of the folks who staffed the Lotus Forum, wrote the books you'd see on shelves at CompUSA entitled "How to Use MS Word", How to Use MS Excel in LWP.
Mijenix is one of many company names that marketed PowerDesk File management utility and it had the "PowerBar" which was a cousin of HP's original Dashboard. Lost popularity when MS added the taskbar but this was far more usable and customizable providing 1 click access to many functions.
Cottonwood Software's File_ex .... lost functionality w/ Vista
http://cottonwoodsw.com/welcome.html#whatsnew