[https://github.com/unicredit/csvtools](https://github.com/unicredit/csvtools) relies on type definitions to automatically generate a CSV parser
[https://github.com/andreaferretti/memo](https://github.com/andreaferretti/memo) defines a `memoized` macro that performs memoization of a function. Memoization is easy to do for non recursive functions, but doing it for recursive functions requires changing all self calls to calls to the generated memoized version, hence a macro [This macro](https://github.com/unicredit/neo/blob/master/neo/private/neocommon.nim#L64) allows to perform FFI calls using the Fortran ABI instead of the C one, as used [here](https://github.com/unicredit/neo/blob/master/neo/dense.nim#L1086) for example. Admittedly this example does not require a macro, but using a macro can automate an otherwise tedious and repetitive pattern.
