Commercial Versionとして、
Intel® Cluster Studio XE Intel® Parallel Studio XE Intel® Composer XEとありますが、Open Source版はこれのベースになっているということですかね?
FAQに次のようにありました。
Are there products currently using the Intel® OpenMP* runtime? Yes, the Intel® OpenMP* runtime is used in Intel® Composer XE and Intel® Parallel Studio XE products. The implementation is recognized as one of the industry’s most-respected and most-used implementations of OpenMP*.