Can you suggest good GI Benchmarks?

GI-improved test subjects with test cases:

• http://www0.cs.ucl.ac.uk/staff/ucacbbl/gismo/ (see Free Code heading)
• http://www.cs.ucl.ac.uk/staff/W.Langdon/gggp/#code (see Free Code heading)
• http://crest.cs.ucl.ac.uk/autotransplantation/downloads/artifact.html

(several frameworks also come with benchmarks, please see GI frameworks above)

Automated program repair, bug repositories:

• http://repairbenchmarks.cs.umass.edu/
• http://program-repair.org/benchmarks.html
• http://groups.csail.mit.edu/pac/patchgen/

Benchmarks identified at the Dagstuhl Seminar on Genetic Improvement of Software:

• Parsec: http://parsec.cs.princeton.edu/
• SPEC INT: https://www.spec.org/benchmarks.html

Additional benchmarks identified from the survey by Blot et al. on benchmarks for GI of non-functional properties:

Search by tool name.