multiple side-by-side versions with Homebrew?

Is it possible to install multiple versions side-by-side with Homebrew?

I find myself in a situation needing sbt-0.7.x, sbt-0.10.x and sbt-0.11.0. I've installed both sbt-0.7.7 and sbt-0.10.1 manually at the moment to work around the issue (with sbt-0.11.0 being the latest 'sbt' from Homebrew).

Yeah. When you install a new version of a package, it keeps the old one. The symlinks in /usr/local/bin or wherever point to the latest version, but you can still call the binaries (or link to the libraries) in the older version.

brew list to see what's installed. You can look in package directories to see all the versions; or call brew list --versions to see all packages and all versions.