SpinDrops 2.0.4 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application is a product of Steffen Glaser, Michael Tesch, Niklas Glaser.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The application lies within Education Tools, more precisely Teaching Tools.
From the developer:
SpinDrops provides a novel approach to understanding magnetic resonance experiments and the underlying spin dynamics. The app teaches fundamental concepts of modern NMR spectroscopy through numerous examples and an online tutorial. The simple graphical interaction helps develop intuition of the mode of action and the design of pulse sequences. Rich dynamics of spin systems (up to three coupled spins) can be explored interactively.
You may want to check out more software for Mac, such as Dolce Music Flash Cards, dvcUniversity or FRS Money Math, which might be related to SpinDrops.