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Business Plan Pro is a good software as well. However I prefer doing it myself.
You can find basic templates if you just googled the word (Business Plan Template) but there is one site that I found a year ago and I think everyone should use if they need some outline to work on.
Link to website: www.bplans.com
However I never used a software for a business planning but you can check out the links below:
www.liveplan.com
www.planware.org
Hope this would help.