Demos are usually made by groups of creative people working together, the so called 'demo groups'. Most of the sceners belong to one group or another, and if you like productions of a special group, you shouldn't hesitate to check out their website and more releases of theirs.
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Since 2003 the hungarian demogroup is grabbing the attention of the demoscene especially with their intros. "Beyond Expectations" is their claim and what they produce.
http://www.assembly.org/
Haujobb hasn't only been in the demoscene for over 10 years now. It is scene history. There has hardly ever been a party where Haujobb didn't win a competition or was at least mentioned in other productions. Its members spread widely across Europe and even further.
http://breakpoint.untergrund.net/
Nowadays, there is only one way of getting around Farbrausch in a competition. When Farbrausch doesn't compete. In the last years, these guys haven't only won piles of competitions. They set a new standard in intro design.
http://www.evoke.eu/
MFX is a standard in the demoscene although you never know what to expect. Once they produce straight forward and catchy demos, the next time you wonder if your monitor finally totally broke. From experimental to compo-winning stuff, MFX has done it all.
http://www.buenz.li/
The Kolor guys have been around since 1996 and have won a number of prizes at several parties. They're universal artists and have done everything from 4kb intros to T-shirt design for demoparties, from classic demos to utmost stylish 3D modelling worlds. Whenever there is a fresh breeze in the demoscene there is a good chance that Kolor has been the source.
http://www.kolor.org/