I’ve just now noticed, but a stable release of Zotero 4 became available earlier this week. This release includes a substantial number of updates over previous versions. For highlights, see here, or peruse the whole change log.
Some of the links above may be “affiliate links.” If you make a purchase or sign up for a service through one of these links, I may receive a small commission from the seller. This process involves no additional cost to you and helps defray the costs of making content like this available. For more information, please see these affiliate disclosures.