You can now get the Total Annihilation: Commander Pack for free on GOG.com, offering a 100% discount on Cavedog's 1997 sci-fi RTS game for Windows and both its expansions. This is yours to keep if you claim your copy by June 7th. GOG.com now also offers DRM free versions of two other games designed by Chris Taylor with the release of the Supreme Commander Gold Edition and Supreme Commander 2, both of which are currently on sale for 80% and 75% off, respectively. On a related note, they also offer The story of Supreme Commander and how Chris Taylor redefined real-time strategy games. Here's more on today's giveaway:

What began as a conflict over the transfer of consciousness from flesh to machine has escalated into a war that has decimated a million worlds. The Core and the Arm have all but exhausted the resources of the entire galaxy in their struggle for domination. Choose your side, build an army, and crush your enemies on huge, three-dimensional battlefields. And remember, there is no such thing as "too many guns"!

• Includes Total Annihilation and both its expansion packs - The Core Contingency and Battle Tactics
• A timeless classic that has won over 57 awards!
• Epic battles with hundreds of units accompanied by frantic music composed by Jeremy Soule and hundreds of available mods