Project Management Institute (PMI) is a leading non-profit organization of project mangers, helping to develop your professional skills and career. PMI issues standards for project management and related disciplines, especially A Guide to the Project Management Body of Knowledge (PMBOK® Guide), which is the elementary standard for project management.
PMI issues following certificates:
Certified Associate in Project Management (CAPM)
Project Management Professional (PMP)
PMI Scheduling Professional (PMI-SP)
PMI Risk Management Professional (PMI-RMP)
Program Management Professional (PgMP)