free alternative to basecamp

I've used BaseCamp to manage the Comm & Mktg projects here with great success. Now that I "get" the project management concept, I'd like to move to an open source/freeware option. Do have any you would suggest? Keep in mind that my team is small (usually
only 1-2 others on some projects, most projects just me) but that I have 25 projects running. Thanks!

Lorrie Jackson
Director of Communications and Marketing
Lausanne Collegiate School (Memphis, TN, USA)
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ljackson@lausanneschool.com
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Skype: lorriejackson
Twitter: lausanneschool or lorriej
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