A good toolchain is important for any development project. It makes the lives of developers easier by abstracting away or automating repetitive tasks. You should always spend some time at the outset of a project making sure you're using all of the best tools available. On an open source project this is 10 times more important. Instead of building a toolchain that will be used by your company or small team, you're building a toolchain that will potentially be used by dozens, hundreds, or even thousands of other developers.

Of all of the new tools that I've picked up using for development in the past six months, there is one that has come to stand above the others for its nearly universal utility. That tool is Guard.

Guard is a RubyGem but don't let that fool you into thinking it's only useful for Ruby projects. Guard is essentially an autotest for everything. It provides a general purpose set of tools for watching when files are changed in your project and taking action based on it. You can use it to do just about anything, but common uses will include: