What is the extensions catalog ?
The extensions catalog provides Slicer users with a convenient way to access the extensions previously uploaded on the extensions server:
- from within Slicer with the help of the extensions manager
- from the web: http://slicer.kitware.com/midas3/slicerappstore
严格来讲：extensions catalog 就是指http://slicer.kitware.com/midas3/slicerappstore这个网址所提供的目录，但因为3Dslicer将该网址的一个通道整合进了发行版的extensions manager功能里，所以，对slicer的用户来讲他们可以方便的从3Dslicer的extensions manager中获取以前上传到extensions server（extensions服务器）的extensions
The Slicer Extensions Catalog is hosted by Kitware using Midas Platform. The Extensions Catalog can also be accessed via your web browser here.
The continuous integration system for automatically building and uploading extensions on a nightly basis is made possible by following Kitware software process best practices. It leverages the CMake/CDash/Midas stack, supported and developed by Kitware.
If you are interested in delivering extensions or plugins to users of your application by customizing your existing software process, do not hesitate to contact us at kitware@kitware.com
来自 <https://www.slicer.org/wiki/Documentation/Nightly/Developers/FAQ#What_is_an_extension_.3F>