AGD Interactive

AGD Interactive (AGDI), LLC. is a non-profit company given a fan license to remake Sierra Entertainment's popular classic adventure games from the 1980s and early 1990s.
History.
Founded in 2001 by Britney K. Brimhall and Christopher T. Warren as Tierra Entertainment, the group is best known for their remakes of the popular "King's Quest" games. AGD Interactive uses "Adventure Game Studio" to create their games.
On December 10, 2003, they stopped using the name Tierra Entertainment and started referring to themselves as AGD Interactive ("AGD" stands for Anonymous Game Developer). Subsequently, in their games, the two lead designers (the two founders of AGD Interactive, that is) are credited as "Anonymous Game Designer #1" (Britney K. Brimhall) and "Anonymous Game Developer #2" (Christopher T. Warren). Actual anonymity is not implied; details on the team are provided online. 
They have also formed a commercial company, Himalaya Studios, which will focus on creating original, point-and-click adventure games with high-resolution graphics.
Released games.
King's Quest I Remake.
AGDI's first release was a critically acclaimed point-and-click remake of ', released for download free of charge on August 8, 2001. This remake is known as "King's Quest I VGA". In the month of its initial release, sales of Sierra's official ' skyrocketed. On January 17, 2009, AGDI released version 4.0 of the game, which, among other improvements, included enhanced backgrounds, the addition of narration vocals, and a new optional feature that can remove the walking dead situations which previously could have caused the game to become impossible to complete.
King's Quest II: Romancing the Stones.
One year after the initial release of their King's Quest I remake, on December 3, 2002, AGDI followed up with the release of their second free remake, a complete overhaul of "King's Quest II". This remake is known as . King's Quest II+ won the 2002 AGS Awards for Best Game, Best Story, Best Animation, Best Music, Best Scripting, Best Documentation. Both games have been greeted by Sierra fans with enthusiasm, and consider these remakes almost equal to Sierra's later "King's Quest VI". On March 14, 2009, AGDI released version 3.0, which features enhanced backgrounds, narrator vocals, character lip-syncing, detailed character portraits, and many other additions that increase the game's overall level of quality.
King's Quest III Redux.
On February 2011, AGDI released a remake of King's Quest III: To Heir is Human. The game is titled King's Quest III Redux, and continues the non-canon plot and lore that was established in AGDI's previous King's Quest II: Romancing the Stones remake. The game is not a 1:1 remake, and is not a complete overhaul like KQ2+ was, but features more fleshed-out characters, new areas, and puzzles not seen in the original Sierra version.
Quest for Glory II Remake.
AGDI's remake of the popular "" was released on August 24, 2008. The remake includes extra content (such as a Saurus Repair Shop that was cut from the original release due to memory constraints), a more interactive battle system, additional dialogue interface options, and the option to have a simplified alleyway layout since the original was hard to navigate. Polygon considers the game to be one of the best fan remakes of a video game ever. PC World's Jim Norris also gave the game 4 out of 5 stars, considering it a "hand-polished classic", and the best of AGD Interactive's remakes.
Canceled games.
Royal Quest.
The "King's Quest" remake was being developed simultaneously with a parody of the same game entitled "Royal Quest: Retrieving Lost Shit". The game was canceled, as the team "believed that it did not promote the values and tone they were trying to preserve in remaking the old Sierra classics."
Space Quest II.
Up until early 2002, the AGDI development team was working on a VGA remake of "". However, due to the lead programmer's sudden disappearance, the development team realized that they wouldn't have the resources required to dedicate to both the "Space Quest II" remake and the "King's Quest II" remake. As a result, the "Space Quest II" remake was put on indefinite hold. A small 3-room demo was released to show the progress that had been done on the "Space Quest II" remake up to the point when it was canceled. Infamous Adventures, another development team that remakes classic Sierra games, has a remake available since December 2011.