Awlsim is a Step 7 AWL/STL/PLC simulator. It achieves good performance of several tens of thousands of AWL instructions per second. S7-3xx and S7-4xx CPUs (with 2 and 4 accus) are supported.
A C++11 unit testing framework based on Perl's Test::More module.
An 8-bit clean, POSIX-compliant line editor.