Intel Cilk Plus is available under multiple licenses:
Open Source License
The commercial version of Intel Cilk Plus is available from Intel in one of the Intel® Parallel Studio XE suites.
Visit our Software Evaluation Center to get a copy of these products.
If you are currently a student and not paid or compensated for software development, Intel® Parallel Studio XE Professional Edition for C++ is available for free for academic use on Linux*, Windows* and OS X*. See http://software.intel.com/en-us/intel-education-offerings and click in the "Student" tab for all the details.
Intel Cilk Plus has been integrated into the "cilkplus" branch of the GCC live-sources. The compiler and associated branches are available at http://gcc.gnu.org/svn/gcc/branches/cilkplus.
Detailed instructions are available at How to Download, Build, and Install Cilkplus GCC on Linux.
Intel Cilk Plus is available in the Clang frontend of LLVM as a project on Github. The compiler and associated branches are available from Github. See the Cilk Plus/LLVM page for information on how to download and build the compiler sources.
The Intel Cilk Plus run time library is being maintained via an upstream, BSD-licensed version. The source for the runtime can be downloaded from the Intel Cilk Plus Download page. This is the complete runtime source to support the Linux* and OS X* operating systems and has been tested on both the x86_32 and x86_64 architectures.
Please help port the Cilk Plus runtime to other architectures!
Changes to the Intel Cilk Plus runtime are welcome! Please see the Code Contribution page for information on contributing to this project.