Major Block Ciphers between DES and AES competitions DES was announced as a standard in 1976. AES competition started in 1997 and Rijndael was selected as standard in 2000. What are major block ciphers and block cipher designs made/proposed from 1976 to 1997?
IDEA and CAST-128 (aka CAST5) first come to my mind as widely deployed/used ciphers. Blowfish and TEA are next. The first two (and to some degree the third) got support in PGP early on.

Update per comment: RC2, RC5, and GOST 28147-89 (in the Eastern block) also have been widely used.

All 7 are 64-bit block ciphers; that's typical of the era, and made these block ciphers a painless substitute for DES and 3DES (the dominant ciphers). They stood the test of time quite well, with no practical attack better than brute force by more than very few bits (except for GHOST, but when used with its full 256-bit key it remains safe enough). While TEA is involved in a notorious incident where a game console misused it for hashing, that's hardly a problem attributable to TEA itself.

Note: I'd have included RC4 if is was a block cipher; that used to be widespread in quite a few commercial applications.