Digital Formats Sustainability: National Digital Information Infrastructure and Preservation Program (NDIIP) website provides information about digital content formats.
FIJI: Feature-packed ImageJ – open source Java image processing program
IIPImage: An advanced high-performance feature-rich image server system for web-based streamed viewing and zooming of ultra high-resolution images. Open source.
CATMAID: The Collaborative Annotation Toolkit for Massive Amounts of Image Data
Bionalogy.com: What we know about how we were born.
KidsHealth.org: What we would better know to raise our lovely kids.
Stickes: Best free Post-it program I have found.
SMath: Free mathematical program like MathCAD.
SciPy: Open-source software for mathematics, science, and engineering (Matlab alternative).
Octave: Matlab-like numerical programming language.