As mentioned in the primary documentation, using the Fiber class directly is generally not recommended. Instead it's recommended that you use some kind of abstraction which uses Fiber internally to create a more flexible or safe interface for your project. Included with node-fibers is the Future class (documented @ node-fibers), however by no means should Future be considered the only option. Listed below are known projects which use node-fibers:
olegp/common-node implements a number of CommonJS proposals on top of Node.js using node-fibers. Fibers are used to emulate multi-threading within a single process, allowing one to use a synchronous programming style.
lm1/node-fibers-promise fibers-promise is a small yet powerful library based on fibers. A promise is just a value container with build-in synchronisation mechanism. Promises allow you to get rid of callbacks clutter.
axkibe/node-green-light a simple stop and go interface to fibers.