strace is described as 'Trace system calls and signals. A diagnostic, debugging and instructional userspace utility' and is an app in the Development category. There are more than 10 alternatives to strace for a variety of platforms, including Linux, Mac, Windows, BSD and FreeBSD. The best alternative is API Monitor, which is free. Other great apps like strace are Sysdig (Free, Open Source), Valgrind (Free, Open Source), ApproveAPI (Paid) and DTrace (Free, Open Source).