Physics / General
- arXiv (physics, mathematics)
- Preprints (CERN Document Server)
- KEK Preprints (High Energy Physics)
- Mathematical Physics Preprint Archive mp_arc (Univ. of Texas)
Astrophysics
- Astrophysics preprint services (European Southern Observatory)
Mathematics
- American Mathematical Society
- Front for the Mathematics ArXiv (UC Davis)
- Preprints of the Research Group in Calculus of Variations and Geometric Measure Theory
- Preprints on conservation laws
Neurosciences and Biology
- BBS Online (Behavioral and Brain Sciences)
- BioMed Central (biology, medicine)
- Human molecular genetics preprint server
- Quantitative Biology (arXiv)