Fitlc
An IDL Production
About
Fitlc is based largely off the light curve fitting routines written by Andy Layden. Fitlc follows the same basic principles but can use amoeba or pikaia for optimization, it can simultaneously fit multiple filters, and has simulations to quantify period errors. The basic idea is to fit a variety of templates to a raw RR Lyrae light curve. Each template is fit over a grid of inital periods using a multi-dimensional chi-sq minimzation function (pikaia or amoeba) to calculate the best fitting combination of amplitude, mean magnitude, and epoch for a given template with a given period.
I tried my best to make fitlc a useful piece of software, so as it turns out there's a lot you can do with it. To facilitate its use I put together a manual. On the right you'll find links to use to navigate the online manual.
Command Line
I started working on a new version of fitlc that is much more flexible. At the moment this is available only through the IDL command line. Eventually I'll work it into the current fitlc gui. Unfortunately it uses a lot of the same function names as the original fitlc, which means that you can't have both the gui and this command line version in your IDL path at the same time. Sorry.
Download fitlc_var here: http://www.mancone.net/tars/fitlc_var_source.tar.gz
Since this is command line based and there are no menus to browse through, you should read the primer about this version, otherwise it won't do much good.