I've seen a lot of BASIC-to-C converters, inspected the source code for a number of them (the transpilers, not the output), and almost universally been disappointed at their poor quality, which I decided I couldn't trust for a real project. This one however, looks like real software engineering went into it (see eg http://basic-converter.org/String_optimization.html), even if the code is... well, it's shell script which looks an awful lot like perl, real arcane magic.