This studio has only custom blocks! If you would like to add a project, post its URL in the comments. When adding a project, make sure there is not a project using the same or a similar block, and if so, don't add your project, unless your version of the block is very different and improved.
P.S. Try going to https://scratchblocks.github.io/#define%20Custom%20block%20studio%0A(%7Bmake%20%5Bsome%20v%5D%20custom%20BL%20()%20CKS%20%3A%3Acustom%0A%7D%3A%3Aring%20grey)%20or%20(%7B%3CLOOK%3E%20and%20(find%20v)%20(1)%20or%20more%20blocks%20you%20need%20%3A%3Acustom%7D%3A%3Aring%20grey)%3A%3Astack