GOG.com's massive summer sale starts today, includes 10 percent off Witcher 3

GOG.com's DRM-free summer sale just went live with freebies, daily bundles and more than 700 games discounted up to 90 percent.

It runs until June 21 at 7:59 a.m. ET.

This year, the GOG.com sale includes three games that are being given away based on how much you spend. You earn a free copy of SimCity 2000 if you spend at least $1. Spending at least $20 will get you S.T.A.L.K.E.R.: Clear Sky and you get Xenonauts if you spend at least $50.>

Among the launch sales are The Witcher 3: Wild Hunt at 10 percent off, Lichdom Battlemage at 87 percent off and 80 percent off Jade Empire. Sales bundles include 66 percent off Lucasfilm Adventures (with Monkey Island, Sam & Max and others) and Enhanced D&D titles at 60 percent off (Baldur's Gate & Icewind Dale Enhanced Editions).

New deals will appear on the site every 12 hours, with more than 100 offers every day.