AG˛ is HL2DM regular Multiplayer with additional features that make the game faster and more addictive and fun to play. The Tau Canon aka Gauss, longjump...
HL²DM Pro is regular HL²MP from VALVe with additional features that make the game faster and more addictive and fun to play. The Tau Canon aka Gauss, longjump pack, bunny hopping, wall jump, brightskin models and hitsound are part of it for instance. The mod features 13 gamemods (FFA, TDM, CTF, Fugitive, Arena, Instagib, ...) and includes GUI for both the players and the admins to control their playing environment or the match by itself (settings, start/pause/abort, ...).
HL²DM Pro features the following among a lot of others that you can find here :
13 gamemods :
FFA, TDM (up to 6 teams), Last Team Standing, Arcade, Arena, Tourney, Fugitive, InstaGib, Capture The Flag/Arcade, Domination, Football / Warball
Management system for server administrator and league organizers
Gameplay Development Kit (GDK)
A gameplay is characterized by the value given to variables that define the rules of interaction of the players with the virtual world. HL²DM Pro includes a built-in GDK that truely enables everyone to create its own gameplay without a single line of code. You can define the movement as well as the gravity and the weapons damages. You can decide what weapons to enable or not, and which weapon shall be present when respawning. You can influence the gameplay in many ways. Defining your own gameplay and testing it is a matter of minutes.
Running maps from other Source mods
HL²DM Pro natively supports running maps from many mods including : Counter-Strike:Source, Day of Defeat: Source, Dystopia, Half-Life 2: Capture The Flag, Hidden: Source, Sourceforts, HL2 Assault (http://www.hl2assault.com/), Golden Eye (http://www.goldeneyesource.com/), Plan of Attack, Battle Grounds 2, Insurgency, Insects_infestation, Fortress_Forever, Pirates,_Vikings,_and_Knights_II