This is an incomplete list of mods already in the making for HL2:
Airsoft Reloaded - http://www.hostultra.com/~armod/Index.html
Description: A CTF/TDM multiplayer mod based off the sport of Airsoft
Badland - http://www.planetbattlefield.com/badland
Description: Automotive gang combat in the Post Apocolyptic era.
Biohazard 1.5 - www.redfox-studios.com
Description: Another Resident Evil adventure from everyone's favorite RCPD cop, Leon Kennedy.
Bushido - http://www.planethalflife.com/bushido/2.0/news.asp/
Description: A swordfighting mod set in Feudal Japan
Chronicles of Fire - http://aotp.chroniclesoffire.net
Description: RPG-like futuristic combat set in the not-so-distant future.
Citadome - http://gearworxprod.com/citadome
Description: After a biological disaster, a government research facility was forced to close down, but movement has been detected inside...
Cold War: Melting Point - http://www.cw-meltingpoint.com/
Description: A modern combat mod based on a trying time during the Cold War.
Combatant - www.geocities.com/combatantmod
Description: None As Of Yet
Cops & Robbers - No Website
Description: A multiplayer mod based off of the childhood game of Cops & Robbers.
Crisis 51 - http://www.planetwolfenstein.com/crisis51
Description: Things have gone wrong in Area 51...again....
Death from Above - www.dfahl2.tk
Description: A mod...based on combat...air combat...with planes...and helicopters...schwing...
DNA Half-Life - http://www.dna-hl.com
Description: No Description Provided on Website
Downtown Dispute - http://www.ddmod.com
Description: A multiplayer mod with gangs, robbers, police, and SWAT. Set in modern times in cities across America with fast sports cars for street racing. Also, including other illegal activities.
Existence - http://www.existence-mod.com
Description: A Half-Life2 sequel to the Half-Life mod of the same name.
Entropy - http://flatline44.bfcentral.com/entropy
Description: MMPORG-esque gang wars, with working character creation and economic systems.
Fall of Sicyon - No Website Provided
Description: No Description Provided on Website
Fallen Faith - http://ff.city-17.net
Description: A mod I subgenre as MMHL2M(Massively Multiplayer Half-Life 2 mod), having a Dungeon Seige-like character stats system, and server hopping for a huge game world.
F.B.I. - http://fbi-mods.daves-hosting.co.uk
Description: No Description Provided on website, I'd bet money on that it has to do with the FBI.
Gettysburg - http://www.gb-mod.net
Description: An expansive, ambitious SP/MP mod based on the American Civil War, winner of numerous awards.
Ghost Ops: The Avalon Project - http://www.ghostopsmod.com/
Description: Future-based black ops missions
Grey City - http://gcmod.city-17.net
Description: A non-linear fps-rpg hybrid set in "Grey City", set up a shop or live a life of crime, take missions or not, it's up to you.
Gundam Power - http://gundampower.moddb.com/
Description: A multiplayer round-based Gundam game, with different variations of deathmatch and an objective-based mode.
Hit Squad - http://www.hit-squad.net
Description: mmporg-ish multiplayer pitting the cops and 2 mafia crime families against each other.
Hostile Freedom - No Website
Description: No description provided on website
International Defense Force - http://www.idf-mod.de
Description: Futuristic war to control a planet.
Jurassic Park Online - http://www.jurassicparkonline.net
Description: An MMPORG mod set in Jurassic Park
Jurassic Rage - http://jurassicrage.city-17.net
Description: A cross of Dino Crisis with Jurassic Park, with it's own unique twist.
La Cosa Nostra - http://www.lcnmod.net
Description: No description provided, however, the CC2 boys are also working on Over The Top
Lambda Co-Op - No website provided
Description: No description provided on website.
The Last Great War - www.lastgreatwar.net
Description: One of the most promising mods, set with an "All Nations with a few exceptions" World War II theme, it is also funded inhouse by the project leader.
Leave No Man Behind - No Website Provided
Description: A mod set in Somalia in 1993
Lines of Fire - http://www.linesoffire.com
Description: Another mod in the up and coming World War I mod genre.
Memnite High - http://www.trepid.net/memnitehigh
Description: Your school has been overrun with terrorists, you have a gun, you know what to do.
Midway to Victory - http://midwaytovictory.city-17.net/
Description: A World War II mod set in the Pacific Theater
Off-Road - No Website Provided
Description: No Description Provided on Website
Operation Carpe Diem - No Website Provided
Description: No Description Provided on Website
Operation Everlasting Shadow - No Website Provided
Description: No Description Provided on Website
Operation: Iron Curtain - http://nova.arm-ent.com
Description: No Description Provided on Website
Operation Shadow Pheonix - No Website Provided
Description: No Description Provided on Website
Over the Top - http://www.xtremegn.com/overthetop/
Description: One of the original WWI mods, made up of DoD forum members, and retired members of The Trenches, among others.
Periculum - http://periculum.moddb.com
Description: No Description Provided on Website
Plastic Attack - No Website Provided
Description: No Description Provided on Website
Project Safan - No Website Provided
Description: No Description Provided on Website
Redemption Ark - http://www.snarkpit.com/redemption
Description: Something happened aboard your starship, not much else is known
Rivals: Organized Crime Redefined - http://rivals.thegamingelement.com/
Description: The title is self-explanatory, gang combat between two opposing factions.
Road to Baghdad - http://nova.arm-ent.com
Description: No Description Provided on Website, made by developers of Operation: Iron Curtain.
Short-Circuit - http://shortcircuit.moddb.com
Description: A fight for power(no, I mean nuclear power plant type power) and survival 50 years in the future.
Snipa Wars - http://www.snipawars.tk
Description: Knives and sniper rifles, what better combination could there be?
South Texas - http://www.trepid.net/southtexas
Description: A hunting/daily life mod set on a Texas ranch aptly named "South Texas"
Spade - http://spade1.netfirms.com
Description: A WW2 mod set throughout the entire war, involving every nation, as well as an SP campaign set around a Commando/Infantry unit
Stargate SGC - No Website Provided
Description: No Description Provided on Website
Stick World - http://www.trepid.net/stickworld
Description: Stick figures that can do more than you have ever imagined.
Sven Coop - http://www.svencoop.com/
Description: The first coop mod for Half-Life, porting to Half-Life 2. Various missions where all the players are on the same team, fighting the AI.
Sylicon Valley - No Website Provided
Description: No Description Provided on Website
Team Assault - http://mysite.freeserve.com/tassault/index.html
Description: TFC, Firearms, and Frontline Force blended into one strange-tasting margarita.
Team Operations - No Website Provided
Description: No Description Provided on Website
Terror Unknown - http://Terrorunknown.moddb.com
Description: A terrorist/police career/conspiracy theory mod...don't ask me...
The Streetz - No Website Provided
Description: No Description Provided on Website
The Awakening - http://awake.halflife.org
The Guardians - http://personal.inet.fi/hima/abina/...odi.txt
Toon-Life - www.dark.se/toonlife
Trench Rats - www.warwickmedia.com
Trepidation - http://www.trepid.net/trepidation
Vertical Assessment - http://a52.topshotter.com/va/index.html
War Grounds 2200 - http://wargrounds.moddb.com
What Lies Through Time - No Website
Wise Guys - http://w1.141.telia.com/~u14110849/wiseguys/
X Labs - http://xlabs.psilon.net
Xtinction - http://xtinctionmod.tk
Zoid's Chaotic Battle - http://zcb.flagrun.net/phpBB2/index.php[/quote]
Some(most?) of them will probably never be released, but you'll have plenty of competition. Good luck, you'll need it.