Red 0.6.1 for

All platforms, last stable
Windows red-061.exe 1 MB
GNU/Linux (*) red-061 1.1 MB
Mac OS X red-061 0 MB

Automated builds, master branch
Windows red-24mar17-8e140bd.exe 1 MB
GNU/Linux (*) red-24mar17-8e140bd 1.1 MB
Mac OS X red-24mar17-8e140bd 0 MB

Zip archive 1.7 MB
Tar.gz archive red-24mar17-8e140bd.tar.gz 1.5 MB

(*) For Linux 64-bit distros, you need to install 32-bit supporting libraries. So, for Debian-based distros, install them using:
    sudo apt-get install ia32-libs libc6-i386 libcurl3

If you are using a Debian 7+ or Ubuntu 13.10+ version, you should use the multiarch way:
    dpkg --add-architecture i386
    apt-get update
    apt-get install libc6:i386 libcurl3:i386

For step by step instructions on compiling your first script, please find them here.