Fly.js vs Sagui: What are the differences?
Developers describe Fly.js as "New generation build system". Fly is a modern build system for Node based in co-routines, generators and promises. Fly has robust error handling, callback heaven, cascading tasks, parallel execution and a simple API. See the documentation to learn more about how to use Fly and write your own plugins. On the other hand, Sagui is detailed as "Front-end tooling in a single dependency". Sagui is all about good defaults. It is the single development dependency you need to worry about, taking care of build, tests and the development server.
Fly.js and Sagui can be primarily classified as "JS Build Tools / JS Task Runners" tools.
Sagui is an open source tool with 695 GitHub stars and 32 GitHub forks. Here's a link to Sagui's open source repository on GitHub.