San Francisco in January could become the first U.S. city to adopt open source software to run its voting machines. City officials last month authorized consulting group Slalom to prepare a report on the benefits and challenges involved in using an open source voting machine platform. The city voted to pay Slalom $150,000 for its research. Meanwhile, the city this year will pay Dominion Voting Systems $2.3 million to renew its contract for the company's proprietary voting machine software. That system is nearing the end of its life cycle.