http://www.gog.com/forum/general/get_rich_selling_mods_giveaway

Courtesy of bler144

snip

Edit: Ninja'd by moon. Should have expected that :D

http://www.gog.com/forum/general/welcome_giveaway_for_steam_defectors_crusader_no_remorse_no_regret

Courtesy of awalterj

http://www.gog.com/forum/general/giveaway_got_a_steam_key_for_call_of_cthulhu_the_wasted_land

courtesy of tfishell

http://www.gog.com/forum/general/because_4x_thats_why_plus_giveaway

Courtesy of HijacK

I just want to let you know that two of my giveaways are still active, and they have both been updated...
 
 
1)  <span class="bold">The survival kit of a point-and-click adventurer!</span>

    Three games have been added, and there are now two ways to enter:

    ▪ Experiment # 1:  You as an adventure game survivor !
    ▪ Experiment # 2:  You as an adventure game developer !

    You'll find more information in <span class="bold">this post</span>...
 
 
2)  <span class="bold">Gimme a sign, I'll give you a game!</span>

    Many games have been added to the giveaway. You can easily grab one of the 60 available games!

http://www.gog.com/forum/general/yet_another_puzzle_giveaway

Courtesy of WildHobgoblin

http://www.gog.com/forum/general/giveaway_thread

Courtesy of AkiMatti

http://www.gog.com/forum/general/tiny_witcher_iii_giveaway

Courtesy of 0Grapher

http://www.gog.com/forum/general/convince_me_on_kotor_not_so_humble_steam_giveaway
Courtesy of ZaineH

http://www.gog.com/forum/general/mrfortyfives_humble_kinda_weekly_giveaway_weeks_5_6_still_going_strong
Courtesy of MrFortyFive

http://www.gog.com/forum/general/a_small_activision_giveaway_contest
Courtesy of ChaunceyK

http://www.gog.com/forum/general/4_years_gog_anniversary_giveaway
Courtesy of Senteria

The Whole Shebang Giveaway. Or, how I went there and back again...

Courtesy of misteryo
 

http://www.gog.com/forum/general/mystery_game_3rd_edition_giveaway

Courtesy of Phc7006

http://www.gog.com/forum/general/original_sin_giveaway
Courtesy of Orion66

http://www.gog.com/forum/general/steamy_random_mixed_lot_giveaway
Courtesy of Briareos262

http://www.gog.com/forum/general/not_so_humble_steam_giveaway_finale

Courtesy of ZaineH