From oldest to newest, mods as noted, a few are Bitsas (bit of this, bit of that):

1950(?) Raleigh Sports, one of a matched pair (my wife has the other) bought from the original owners in 1987.
1962(?) Schwinn Speedster. RM-25s on Bendix 76 R, Atom alloy F.
1973 Raleigh Pro Track. Pretty sure it didn't come with the tied and soldered Nisis.
1974 Raleigh International. Bitsa bike. I do have the right coded rear derailleur.
1975(?) Viscount. FG winter bike since 1990. Another Bitsa.
1986(?) Vitus. Total Bitsa.
1987 Schwinn Cimarron. 20+ years of hard use. Matrix Singletracks on Dura-Ace 8S hubs since 1989, works great with D-XT 7S thumbshifters.
1990 Davidson Stiletto. Bitsa.
1993 Davidson Track. Record 151 crank, SL pedals, Fiamme Speedy rims on C-Record hubs, SR Pista threadless (really) headset.
1996 Schwinn Homegrown Full Suspension. Built with D-XT of mixed vintage 1987-1995, Judy DH, either Mavic 261s on Campy Tipo hubs or Mavic 217s on Deore LX hubs.

I try to keep it to ten bikes that I can ride and that I want to ride.