Charm++ is a portable adaptive runtime system for parallel applications. Application developers create an object-based decomposition of the problem of interest, and the runtime system manages issues of communication, mapping, load balancing, fault tolerance, and more. Sequential code implementing the methods of these parallel objects is written in C++. Calls to libraries in C++, C, and Fortran are common and straightforward. Charm++ is portable across individual workstations, clusters, accelerators (Cell SPEs and GPUs), and supercomputers such as those sold by IBM (Blue Gene, POWER) and Cray (XT3/4/5/6). Applications based on Charm++ are used on at least 5 of the 20 most powerful computers in the world.
Anchor automatically adds curly braces and semicolons to code written in various programming languages, saving typing and making programs easier to read. It lets you pretend to be coding in Python or Lua while actually writing standard C, Java, PHP, C++, .NET, C#, or D. A script may generate files in the target language and invoke the compiler. An example bash script integrates with TCC to make runnable "scripts" with the speed of C. The scripts are easily modified to target another compiler or interpreter.