Below is the combined code in .zip and .tar.gz formats. Please remember all of this a major work in progress and is by no means finished. We should all try to make this site comparable to it s IDL predecessor. We need YOU to write good, well documented code that will make this repository complete. The following is the minimal amount of code needed to filter and locate particles in 2d. The version of track here is fully 3D and the 3D feature and bpass are coming.