The Social Enterprise Alliance sells business plan software for non-profits that include earned income ventures:

Business Plan Pro-Social Enterprise Edition was developed in partnership with Palo Alto Software specifically for nonprofit organizations as an easy-to-use blueprint and interactive planning tool for successful earned income ventures.

The wizard-driven software produces a social enterprise plan that includes market analysis, strategy and implementation description, social return on investment, sales forecast, personnel plan, and financial statements.

Link.

(Not useful for most churches, I know, but I’m associated with a couple of organizations that might find this useful. Looks like it’s Windows-only.)