Useful online tool to draw graphs starting from a math function. Free, of course!

graph math functions

Finally, a well written guide to Regular Expressions for Javascript. I've been looking for it for ages.

javascript regular expressions

I guess it's the best tool to verify the availability of domain names online. quick and easy ;)

domain names

A free gallery of vector graphics. Different styles and artists... It will certainly turn useful!

gallery graphics vector

A very nice website to find job opportunities in Beijing, China. It's a kind of special: you just upload your resume' and the system spits out a list of "best matching jobs". Surprisingly ac

beijing job opportunities search

probably the best search engine to find the cheapest tickets available, worldwide!

flight tickets search