Writing such software requires a tremendous amount of work!
I work on this project for over a year. Not full time, i must also work "to eat"! But it represents many hours, believe me. Even minimal recognition is always welcome.
On the other hand, I have many ideas for improving ReactivUfo but will ask some investment:
3D magnetic field sensor
high-frequency spectrometer
SLR camera Canon EOS (...)
So by making a donation, you encourage me to continue this work and you give me the means to go even further.