What installable component provides 'launch groups' in Eclipse?

While E-Riz's answer is correct, if you just want to add the "Launch Group" feature onto an existing eclipse install, you can install just the extension called "C/C++ Remote Launch". (org.eclipse.cdt.launch.remote)

Note: this extension is entirely language independent, can be added to any type of eclipse install. The "C/C++" part is probably just because it originated from CDT.

(CDT is a collection of eclipse extensions: http://www.eclipse.org/downloads/packages/eclipse-ide-cc-developers/lunar)

I understand now. Based on this page, it looks like it's contributed by the CDT feature set (as of version 6.0). Check that your colleague has CDT installed.