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Eiffel Software
EiffelBase is a library of fundamental structures and algorithms covering the basics of computing: kernel, data structures, math and persistence.
EiffelBase is part of EiffelStudio.
The source code (except for the external C routines) was previously made available under the IFELL "shared source" license. As such, it has been ported to Visual Eiffel (where it is included in the distribution) and to SmartEiffel (as part of the Rainbow Eiffel package).
As of version 5.6, the source code is dual-licensed under the EFL2 or proprietary licenses.
The Iterations Library provides high-level templates that avoid using control structures such as loops.