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Open-source software addresses three crucial needs of users: it is easy to customize, it is inexpensive, and the user's future is not tied to that of a vendor company. Although the software the authors describe in this month's column is still too formidable for an individual practitioner, moderate-sized organizations should consider it near the top of the list. Let us hope that programmers develop a version tailored for solo and small group practices soon. We will report on it in this column when it occurs.