PRTest (The Plain Random Tester)

PRTest is a plain random tester for C: It natively executes the program under test and injects input values from a uniform distribution. 
To reduce the size of a produced test suite, PRTest only keeps test inputs that explore new program branchings.

For more information, see article Thomas Lemberger. Plain random test generation with PRTest. International Journal on Software Tools for Technology Transfer (STTT), 2020. Springer. and the source-code at GitLab.