The best alternatives to Gitshowcase are Stockroom, Appolo, and Devolio. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Gitshowcase?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Creating an automatic portfolio based on Github profile. When building a project, we get a profile and repositories with the Github API and generate an html file based on the chosen one.