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.
Eero is a binary-compatible variant of Objective-C 2.0, implemented with a patched version of the Clang/LLVM compiler. It features a streamlined syntax with improved readability and reduced code clutter, as well as new features such as Python-like indentation and a limited form of operator overloading. It is inspired by languages such as Smalltalk and Ruby.