- Joomla.org - free, open-source content management system (CMS)
- ABC Linuxu - Czech website dedicated to Linux (articles, news and an excellent forum)
- Wikipedia - free encyclopedia that anyone can edit
- $\displaystyle\sum_{n=1}^{\infty}{\frac{1}{n^2}}=\frac{\pi^2}{6}$
Useful addresses
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