http://languagelog.ldc.upenn.edu/nll/?p=2
All Synthèse books published before 2005 appear to be free to download in .pdf form from Springer. I haven't verified that this is true for IP addresses outside of universities with a subscription, but I think it is.
This include the series Studies in Linguistics and Philosophy, but there are likely to be other titles of interest to some LLOG readers.
[h/t Kai von Fintel]
