Updated ZenTao to 15.5

ZenTao (ID : 559) package has been updated to version 15.5. ZenTao is a leading Open Source project management software, which offers Lifetime Free Upgrade, focuses on software development projects management, and supports Story management, Sprint and task, bug tracking, Scrum, Waterfall, Roadmap, Self-Hosted, Your FREE project management too! View Demo and review of ZenTao