Free

Algodoo
2D physics sandbox for drawing and simulating scenes with gravity, fluids, springs, optics and more. Great for learning physics.

Keeping up with the news and building knowledge

2D physics sandbox for drawing and simulating scenes with gravity, fluids, springs, optics and more. Great for learning physics.

Self-hosted RSS reader that follows all your feeds in one place and syncs with mobile apps.

Markdown notes stored on your own disk, linked together into a personal knowledge base.


Collects, organizes and cites your research sources. The browser connector saves papers and pages in one click.

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