Using
github.io to create a personal portfolio website of your GitHub projects:
Here are some examples from GitHub to browse around:
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Additionally, creating animated GIFs to showcase your projects working is really nice, especially for mobile apps. These can be embedded into the repo's README using GitHub markdown.
There are a number of tools to use to create the animated GIF, but a simple one is LICEcap:
The file size can't be too big, or it won't play as expected within the README, but that shouldn't be too hard to achieve.