Currently in beta mode, this website, created by Don Cruse (who also created DocketDB, which is focused on tracking Texas Supreme Court cases), covers current U.S. Supreme Court activities. It tracks the Court's docket, organizing cases by: the circuit or state in which they originated, cases with Calls for the View of the Solicitor General (CVSG), amicus filers at cert level or overall, and direct appeals from three judge courts. There is also a Quick Link option, which takes you directly to cases that originated in your state, with a link to the corresponding federal circuit.
Within each category, cases are listed at their current stage, including: if there has been a petition filed, if certiorari has been granted, or if a case has been argued or decided. When you click on a particular case name, The Cert Pool provides the docket entries for that case, along with the names of the parties and counsel. If you click on the counsel's name, it will tell you how many times that counsel has appeared before the Court since 2008, and which party he or she represented. There is also the option to track updates to cases of interest via RSS feeds.
Because The Cert Pool is still in beta, there are no links to briefs or case opinions, though there are plans to add them later, along with additional information such as Justice voting patterns or news articles. If you are interested in what the Supreme Court is up to, or if there are particular cases you want to follow, this website is worth checking out.