High Quality Content by WIKIPEDIA articles! Marketcetera is a financial software company that has developed the Marketcetera open source trading platform, linking financial exchanges to users through broker services—essentially itself acting as a meta-broker—allowing the development of automated trading systems. The Marketcetera platform uses the ACTIV Financial data steam services for a real-time low-latency equity data feed. The open platform uses the open source library QuickFIX to implement the standardized FIX communication protocol. Marketcetera has offices in San Francisco and New York.