At my work, we have (all in-house and most are more than twenty years old): - A (much more complicated) make clone - A test running framework - A remote

At my work, we have (all in-house and most are more than twenty years old): - A (much more complicated) make clone - A test running framework - A remote session tool - A test specification framework - A preprocessing tool - At least six domain-specific languages for specifying compilers, assemblers, linkers, simulators. Of course, you also need to know Linux, bash, C, C++, Perl, and Python. Needless to say, it takes some time to get up to speed. On the other hand, you can run some very simple commands and have a bunch of servers run hundreds of thousands of tests on your code, on different OSes.