Description: MathJax is an open source JavaScript display engine for mathematics that works in all browsers. It allows you to include math equations and formulas on your website that will render beautifully cross-browser.
Type: software
Pricing: Open Source
Description: Teddit is a privacy-focused alternative to Reddit. It has a similar community and discussion board format but does not track or profile users. Teddit focuses on anonymity and free speech within legal bounds.
Type: software