CourtListener is a core project of the Free Law Project, a non-profit with the lofty and laudable goals of providing free, public, and permanent access to primary legal materials and to develop, implement, and provide public access to technologies useful for legal research (among other things),
CourtListener has a clean, easy interface, clear messaging on coverage, and the ability to filter by percedential decisions, which they have over 2.2 million of. Check it out.
CourtListener has created the first API for U.S. court opinions. As Bob said: “Essentially what that means is that other computers can talk to Free Law’s computers and use its data and search engine for their own purposes.” Cool that this is available to our U.S. colleagues. CanLII’s API information is here.