L-Function
Tables of Brian Conrey and David Farmer: These vintage 1990s tables contain
lots of explicit representations of modular forms of low weight and level
as eta products and expressions involving Eisenstein series, etc.
1990s: A decade ago,
Henri Cohen, Skoruppa,
and Zagier made extensive tables of modular forms.
They nearly published their tables in book form, but got bogged down in technical
details. Here's what page one of a secret copy looks like.
The authors seem to have decided not to publish the book in the traditional way,
so their tables may appear on the web soon (but I doubt it).
1975:
The Antwerp Tables contain data about elliptic
curves of conductor at most 200.
1972: Wada made a 128 page table of characteristic polynomials
of Hecke operators Tq acting on S2(Gamma0(N)),
with N <= 997 prime. Here's the cover page
and a piece of page one.