Seavus Project Viewer - Seavus Project Viewer is a stand-alone software used by team members to open, view and analyze Microsoft Project plans (.mpp files).
Project Viewer 365 - Free Viewer for Microsoft Project MPP Files
GANTTzilla - Online MPP, MPX, Planner documents viewer with publishing, sharing and versioning support.
Microsoft Project - Microsoft Office Project gives you robust project management tools with the right blend of...
FoxPlan - Web-based project collaboration tool
LibrePlan - LibrePlan is an open source web application for project planning, monitoring and control.