A tool that has as its dependencies practically every useful and still-supported Golang linter and static analyzer out there. Plug it into your toolchain and it'll do the work of two dozen other tools (which it is, really) in less time.

Can also be used locally, through your IDE or editor.

A boot floppy image that can be used for booting weird or recalcitrant machines from other devices, such as CD-ROMs.

A live distribution of Linux that clocks in around 200MB. Has 32-bit and 64-bit ports. Can be installed on any removable media, from an iPod to a CD. Basically, it's a version of Slackware optimized for use as a live distro. Modular - easily customized by installing or removing discrete modules. Has a community support module repository. Designed to boot faster than any other live distro. Even includes full X desktops if you want them. Can even be installed to your hard drive if that's how you roll.