vcm plugin for vapoursynth version r50+, is free and the author does not give any guarentee for its operation. It may be downloaded and used at the users risk.
vcm has functions which can be broadly grouped as:-
1.those that modify pixel value to reduce noise or some other criteria,
2. those that reposition or move the pixels to compensate geometrical distortions or rotate,
3. Those that operate in frequency domain and require libfftwf3-3.dll ( or FFTW3.dll or fftw.dll of fft.org) in path and
4. miscellaneous category used for testing as requested by some academia. The full list is given below. Also some examples of script and some results are given for each group in Script panels. These functions are thread safe. 32 and 64 bit versions as well as documentation are included.