Generalised Lomb-Scargle periodogram
Based on:
M. Zechmeister & M. Kürster, The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms, 2009, A&A, 496, 577 [pdf, bibtex]
A collection of the GLS for different programming languages available in
The online demo version (http://raw.githack.com/mzechmeister/GLS/master/javascript/gls.html?run) is based on Javascript and runs in the browser without any installation.