TmaxSoft is a South Korea-based multinational corporation specializing in enterprise software. It was founded in 1997 by Professor Daeyeon Park, former Professor at KAIST (Korea Advanced Institute of Science and Technology). The company is separated into 2 businesses: TmaxSoft and TmaxData. Currently, TmaxData is run as an affiliated company.
The company started as a middleware solution provider. It is now the largest provider of enterprise software systems in South Korea, as of 2007  and is a member of the JCP. Its middleware products include Tmax (Transaction Process Monitoring Solution), JEUS (Web Application Server), and the WebtoB (Web Server). Other products include Tibero (DMBS), ProSync, Sysmaster (Application Performance Monitoring), ProFrame (Application Framework for banking), OpenFrame (Mainframe legacy rehosting solution), and big data solutions (ZetaData, DataHub, and AnyMiner).