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.
WikiPL provides a Python programming environment hosted in a MediaWiki server. Each article in the wiki contains either a Python function or a class named as the article's title. Moreover, the article can contain the source code, documentation, unit tests, development edition, permissions, and form elements for the parameters of the function. Users can view the documentation or edit and execute the source code. Execution can happen either on the local computer, on a remote server, or in the browser (through Pyjamas). Code in one article can be invoked by another article through regular function calls, without any changes to the syntax of the Python language. It also offers a package that imports article code into a local Python namespace for offline development.