iRise Studio, Shared Server: Studio, a sophisticated modeling tool, is the most advanced in the bunch today. Customers use it for requirements definition, prototyping and early usability feedback, among other things. The company\u2019s server software allows real-time collaboration and manages check-in\/check-out of documents by various group members. Companion reader software lets business-side customers view models of applications. Serena Composer: Lower-cost modeling tool, not quite as robust as iRise, lacks the collaboration and group tools. Recently added free reader software for its customers. Sofea Profesy: Similar to Composer, Profesy offers modeling tools aimed at business analysts. Sofea\u2019s customers often focus on formalizing business processes and simulating how back-end systems will interact. Lacks free reader software.