I'm still bummed that CPU manufacturers basically killed off the third party chipset industry. Maybe it was inevitable when memory controllers moved on-die, but I remember when there was actual competition in the chipset business.
For Intel, you just picked an Intel chipset and that was that.
* Rise: https://en.wikipedia.org/wiki/Rise_Technology
* NexGen: https://en.wikipedia.org/wiki/NexGen
* NatSemi: https://en.wikipedia.org/wiki/Geode_(processor)
* WinChip/Centaur: https://en.wikipedia.org/wiki/Centaur_Technology
* NEC: https://en.wikipedia.org/wiki/NEC_V20
And other more obscure options. Most were gobbled up by the other giants (AMD/ATI, Nvidia, Intel, etc).