# Run-time infrastructure (simulation)

In simulation, run-time infrastructure (RTI) is a middleware that is required when implementing the High Level Architecture (HLA). RTI is the fundamental component of HLA. It provides a set of software services that are necessary to support federates to coordinate their operations and data exchange during a runtime execution. In other sense, it is the implementation of the HLA interface specification but is not itself part of specification. Modern RTI implementations conform to the IEEE 1516 and/or HLA 1.3 API specifications. These specifications do not include a network protocol for RTI. It is up to the implementors of an RTI to create a specification. Due to this, interoperability between RTI products and often, RTI versions, should not be assumed unless the vendor specifies interoperability with other products or versions.

## Known implementations

Commercial :
| Name | Vendor | Standard | Bindings | License |
| CAE RTI | CAE Inc. | 1.3, IEEE 1516 | C++, | Commercial |
| Chronos RTI | Magnetar Games | IEEE 1516 | C++, .NET | Commercial |
| MÄK High Performance RTI | MÄK Technologies | 1.3, IEEE 1516-2000, IEEE 1516-2010 (HLA Evolved) | C/C++, Java | Commercial |
| HLA Direct | General Dynamics C4 Systems | 1.3 | ? | Commercial |
| SimWare RTI | Nextel Aerospace Defence & Security S.L. | 1.3, IEEE 1516-2000 | C++ | Commercial |
| Openskies RTI | Cybernet Systems | 1.3, IEEE 1516 | C++ | Commercial |
| Pitch pRTI | Pitch Technologies | 1.3, IEEE 1516-2000, IEEE 1516-2010 (HLA Evolved) | C++, Java, Web Services | Commercial |
| Mitsubishi ERTI | Mitsubishi Electric Corp. and Mitsubishi Space Software Co. Ltd | 1.3 | C++ | Commercial |
| RTI NG Pro | Raytheon Company | 1.3, IEEE 1516-2000, IEEE 1516-2010 (HLA-Evolved) | C++, Java | Commercial |
| Non-commercial |||||
| Name | Vendor | Standard | Bindings | License |
| BH-RTI | Beijing University of Aeronautics and Astronautics Virtual Reality Laboratory | 1.3, IEEE 1516 | ? | ? |
| MATREX RTI | Dynamic Animation Systems | 1.3 | C++, Java | US Government |
| CERTI | ONERA | 1.3 partial, IEEE 1516 partial | C++, Fortran90, Java, Matlab, Python | GPL, LGPL |
| EODiSP HLA | P&P Software | IEEE 1516 partial | Java | GPL |
| The Portico Project (formerly jaRTI) | Open LVC Group | 1.3, IEEE 1516, IEEE-1516e | C++, Java | CDDL |
| Open HLA | | 1.3, IEEE 1516-2000, IEEE 1516-2010 (HLA Evolved) | Java | Apache License |
| OpenRTI | FlightGear project | 1.3, IEEE 1516-2000, IEEE 1516-2010 | C++ | Lesser General Public License |
| RTI-S | Naval Warfare Development Command | 1.3 partial, 1516e partial | C++, Java, Ada | US Government |
| Rendezvous RTI (formerly known as Reusable Architecture for Interoperable Universal Simulations Project # 94) | National University of Sciences and Technology (NUST), Pakistan | 1.3 | C++, Java | NUST |
| Discontinued |||||
| Name | Vendor | Standard | Bindings | License |
| GERTICO (German RTI based on Corba) | Fraunhofer IOSB | 1.3, IEEE 1516 | C++ | Bundeswehr |
| GMU RTI | George Mason University | 1.1 | C++ | Free software license |
| jaRTI (renamed to Portico) | littlebluefrog labs | 1.3 partial, IEEE 1516 partial | C++, Java | CDDL |
| RTI NG | DMSO | 1.3 | C++, Java | |
| SXTA | | IEEE 1516 | C# | BSD license |
| XRTI (Extensible Run-Time Infrastructure) | Naval Postgraduate School | IEEE 1516 | Java | BSD license |
| yaRTI (yet another RTI) | | 1.3 | Ada, C++ | GPL |
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