http://www.gnu.org/licenses/license-list.html#SoftwareLicenses The GNU (glad it's not unix) organization's very long list of "GPL-like" (gnu public license like) licenses with comments about each one and comparisons in the individual annotations to other "GPL-like" and to NOT "GPL-like" public licenses. And excellent list, but a "long read" and a list that is not yet easily computer search-able or cross-referenced.