Thlaylie said:
I think some or all of them are in the original Traveller Library Data books?
No.
The races mentioned therein are not presented as playables.
The following have CT Alien Modules: Aslan, Droyne, K'Kree, Solomani, Zhodani, Vargr, Darrians, Hiver.
The following appear in CT adventures with CGen: Droyne (A3), Chamax (DA5), Vargr (TTA), Zhodani (A0)
CT JTAS Articles include CGen for: Aslan, Vargr, Ael Yael, Newts (Bwaps), Virushi, Dolphins, Grugach'kar.
References without CGen notes of any kind: Lewellolly (Dandies) (TTA), Eiboken (TTA), Vegan (S11 Lib Dat M-Z), Ithklur (AM hiver)
MT has a lot of article add-ons, but they are of questionable status...
DGP AM's, CGen: Vilani, Vargr, Solomani, Aslan, Culturally Aslan Humans
DGP AM's, Refs only: Chimps, Gorrillas, Orangs
DGP MTJ: Jonkerer (CGen included)
Lib Data Refs only: Hiver, Zhodani, Droyne, Darrian, Sword Worlder, Arden, Vegan
Other with CGen: Hlassani
Others without CGen: Sambqys, Geonee
TNE has only three with full CGen, and one isn't canon... Hivers and Ithklur are canon; the Vegan treatment in Traveller Chronicle isn't canon, tho' the vegans are canon, and it's a shame the treament isn't canon. Zhodani, Aslan, Vargr, and IIRC Darrians have minimal CGen notes in RegSB. Several races have minimal references made, ISTR the Geonee.
T4 has Aliens Archive... which includes a few of the above mentioned (Newts, Virush, ISTR Ael Yael, Geonee), some decent ones, and a number of bad ones. If I can get to it this week, I'll list the rest.
T20 adds the Ursa. But they are not properly Canon, either.
GT adds a whole bunch, but GT, not being "GDW/IG/Mongoose", they are also not properly canon. Several of the GT races are prior inclusions in ICE's Spacemaster Companion (Which included the Altha, Whirr-kol, and a couple others...) according to a number of people; I'm not a GT fan, and can't say for certain. A number of them are adaptations of OTU races mentioned above.