Right now, there is a small (but growing) number of libraries useful to games that install out-of-the-box using volo. Here's a list of some current known ones and their state.
You may run into a library where 'volo add' installs the entire source tree, rather than just the consumable bits. If it's not already listed here, please file an issue.
If you're a bit more adventurous and comfortable with package.json files, please help teach volo about unusual browser libraries.
If you're a library maintainer and you'd like your library to work with volo out of the box, see the browser library best practices documentation.