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http://arxiv.org/ includes: Cosmology and Extragalactic Astrophysics ; Earth and Planetary Astrophysics ; Galaxy Astrophysics ; High Energy Astrophysical Phenomena ; Instrumentation and Methods for Astrophysics ; Solar and Stellar Astrophysics

arXiv.org e-Print archive

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http://www.ecalc.com/

Online Scientific Calculator and Math Help | eCalc

Online Calculator and Math Help eCalc is a free and easy to use scientific calculator that supports many advanced features including unit conversion, equation solving, and even complex-number math. eCalc is offered as both a free online calculator and as a downloadable calculator. Input Mode (Algebraic vs.