Tables of Elliptic Curves

Antwerp IV (1970s: Birch, Swinnerton-Dyer, et al.): all 749 curves of conductor up to 200 (modulo errors)
Cremona (1980s-now): all 78198 curves of conductor < 12000.
Brumer-McGuinness (1989-90): 310716 curves of prime conductor < (not all curves of prime conductor < )
Watkins-Stein (in progress): 44 million curves of conductor < . (Not all!)
Stein (2000-now): Abelian varieties: higher-dimensional analogues of curves.

Antwerp IV (1970s: Birch, Swinnerton-Dyer, et al.): all 749 curves of conductor up to 200 (modulo errors)