jike-calendar is a free Chrome add-on developed by june.ly.neu. It falls under the category of Browsers, specifically Add-ons & Tools. This add-on provides a simple feature of displaying the jike calendar. However, due to the unavailability of the jike API, the content source has been changed to yiyan and juejin.

The jike-calendar add-on offers a straightforward functionality of showcasing the jike calendar. Users can easily access the calendar within their Chrome browser. While the add-on's main purpose is to display the jike calendar, it utilizes the yiyan and juejin platforms as alternative sources for content.

Please note that jike-calendar is a free add-on and can be installed directly from the Chrome Web Store. It is a convenient tool for those who prefer to have quick access to the jike calendar while browsing the web.