Table of the Nuclides (at LANL) Table of the Nuclides (at LANL): Containing Moller and Nix evaluation as well as experimental data (Theoretical) http://t2.lanl.gov/data/map.html
Table of the Nuclides (at BNL) Table of the Nuclides (at BNL): Masses and reaction data for all nuclides across the periodic table. (Theoretical) http://www.dne.bnl.gov/CoN/
NN-OnLine NN-OnLine: The Nijmegen database of nucleon-nucleon and hyperon-nucleon experimental scattering data, phase shifts, partial wave analyses, and potential models. (Theoretical) http://nn-online.org/
Nuclear Theory section of arXiv (lanl) preprint server Nuclear Theory section of arXiv (lanl) preprint server: About half a dozen new articles in nuclear theory get submitted here every weekday, most of them en route to paper journals. Archives go back to 1992 and can be searched. (Theoretical) http://arXiv.org/archive/nucl-th
Journal of Physics G Journal of Physics G: Nuclear and Particle Physics Journal from the Institute of Physics (UK) (Theoretical) http://www.iop.org/Journals/jg
Physical Review C Physical Review C: Major Journal of Nuclear Physics. All articles back to volume 1 in 1970 are available for download. (Theoretical) http://prc.aps.org