3 Similar Sites like Kvas.org

SPIE, the international society for optics and photonics spie.org

SPIE is a non-profit dedicated to advancing the scientific research and engineering applications of optics and photonics through international conferences, education programs and publications.

Astronomical Society of the Pacific astrosociety.org

The Astronomical Society of the Pacific is an international non-profit scientific and educational organization, founded in 1889, that works to increase understanding and appreciation of astronomy.

RASC | Inspiring Interest and Knowledge of Astronomy Since 1868 rasc.ca