Is there a list of incubators or startup communities that are based in Germany?

The Founder Institute now operates in Berlin. That would be the only American incubator, from Silicon Valley, in Europe.

Did you try googling? I got this result.

1. HackFwd, Hamburg.
2. Hasso Plattner Ventures, Potsdam
3. Acton Capital Partners, Munich
4. New Commercial Room, Hamburg

Here's a directory of German incubators and business parks: http://www.spica-directory.net/associations/?id=26

There are many incubators, it depends also on the industry you're interested in:

• As mentioned above, Berlin is big in webdesign, etc.
• You'll find engineering (mechanical and chemical, biotech) in and around Aachen
• Munich and Stuttgart has a lot going on regarding automotive
• Munich in general has a lot going on regarding IT
• There is quite a bit of biotech in Düsseldorf

Hope this helps.

Wow, the answers here are ancient.

As of May 2013, the best way to find startups, events, incubators and investors in Germany is via AngelList - https://angel.co/germany

You can also visualize them on a map - http://startupsbio.me/