Here a documentation for GSvit open source sofware for FDTD calculations is provided. It can be used for various calculations of electromagnetic field propagation and interaction with different objects (see features list for a summary). Software can be downloaded at the Download page.
The documentation provided here is a living document, being continuously updated to be compatible with the last stable version of GSvit. See NEWS for details on features and algorithms changes for a particular version.
We will be happy for your feedback, see Contacts for details.