San Antonio Astronomical Association: Club information, events, astronomy news and issues, and links to related sites.
San Antonio Audubon Society: Conservation and birding club. Includes local birding sites, siting list, and information on meetings and membership.
San Antonio Botanical Garden: Offers educational events, programs, and classes year-round.
Scobee Planetarium: At San Antonio College. Information on public shows and school and continuing education programs.
South West Research Institute: Non-profit applied research and development organization specializing in the creation and transfer of technology in engineering and the physical sciences.