In the last 10 years mainly these:
built-in thinkpad keyboard
My go-to laptops are thinkpads, because it seems they receive the best community support. I don't feel too strongly about the specific keyboard version, except I've switched to Japanese-layout module in the T440p that I use the most. This had become a priority since I dropped Colemak in favor of Maltron, hence require more thumb keys.
Noppoo Choc Mini
My first favorite fancier keyboard almost 10 years ago. I immediately fell in love with the 75% layout, Cherry MX Red and thick Cherry-profile POM keycaps. I still keep it around, even though I've switched to more ergonomic layouts, but it's the reason why the plan to do something about the mediocre internal construction fell by the wayside.
TypeMatrix 2030 USB
I learned to type on the stagger-free layout on this one back in 2013, and have kept it around for a long time as the travel keyboard to use with lab computers (in part because of firmware support for Colemak) and then in the office. I liked the solid, compact assembly with a protective skin to make it nearly silent and spill-proof. Some of the most pleasant "scissor switches" that I've used, close to contemporary Logitech Perfect Stroke.
ErgoDox
My first DIY keyboard. I assembled it almost stock—with the exception of Cherry MX Clear switches that turned out to be overwhelming—from the original MD sale 9 years ago, but soon rebuilt it with FalbaTech cases, the 80key layout, vintage "ghost" blacks and a varied mix of keycaps. The modified thumb clusters have mitigated the layout's main shortcoming and so it became my most comfortable keyboard by far for more than 5 years (with an extended break while the cheap TRRS cable broke and it took me more than a year to order a replacement).
Access-IS 15×8 POS keypad
Decent keyboard, with keycaps swapped for Cherry's and a keymap similar to TypeMatrix but with more thumb keys, it served me while I rebuilt the aforementioned ErgoDox. The Cherry MX Black switches in this one are surprisingly smooth. I don't ever use it anymore though, because of the bulky case and PS/2-related inconvenience.
CM Storm QFR
Plain old CM Storm QFR with stock Cherry MX Black, but I swapped the controller for Frostly Flake and keycaps for early PBT doubleshots from Vortex. It was comfortable enough (running Easy AVR firmware with wide-mod keymap) for most of the time while my ErgoDox' cable was broken. I spent lots of time on campus though, so it didn't see much use. I've passed it on already.
Phantom
My second DIY keyboard, although I didn't build it entirely myself, only put the PCB in a ghetto case. The main feature is the 7bit layout without any stabilizers. Set up with Cherry's sculpted keycaps and the Easy AVR firmware (wide-mod keymap), it was my other daily driver along with the ErgoDox. Sadly, I eventually started noticing key chatter, but still keep it around.
Topre Realforce 91U
It was relatively cheap, perhaps because of less than ideal keycaps. I didn't get Topre because of the key feel. In fact, my finger joints sometimes hurt from even 45g Topre domes. It's on my to-do list to swap them for something else, I even experimented with using BTC's and other old OEM domes (without much success). I like the Japanese layout though, if isn't clear yet, and this capsense seems reliable thus far, hence it's a backup in case I run into key chatter in whatever my main keyboard is.
Kinesis Advantage 2
When I first tried Kinesis Advantage, the shape was interesting, but while I had ErgoDox next to it, the scratchiest Cherry MX Brown switches and buggy stock firmware turned me off… Until I found a good deal on Advantage 2 that has fixed both issues thanks to retooled switches and SmartSet firmware. It's so convenient that I haven't moved on to newer ergonomic keyboards in about 2.5 years already.
what's next
I have a few fancier ergonomic keyboards lying around (Dactyl-Manuform 6x6, Keyboardio M01), I just haven't fully committed to either yet. For portable usage, I've assembled Katana60 and found a couple of TECKs, but each has switch problems that I haven't fixed yet either. I'm comfortable enough that it seems difficult to motivate myself to build an entirely custom keyboard with my ideal layout.