The Source engine is a 3D game engine developed by Valve Corporation. Its unique features include a large degree of modularity and flexibility, an artist-driven, shader-based renderer, accurate lip sync and facial expression technology, and a powerful, efficient and completely network-enabled physics system.

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Following the free to play release of TF2, Source SDK has been accidentally released free, and will remain that way.

Posted by INtense! on Jul 4th, 2011

This news comes a little late, but for those unaware due to the recent release of a free Team Fortress 2, the Source SDK will soon become free to use in its entirety, for everyone (confirmed by Valve's Robin Walker in this RockPaperShotgun article). The free SDK was first uncovered in our forums on the 28th of June by an enterprising young man going by the name of Riley, who just happens to be the playtest leader of esteemed Source mods Zombie Panic Source and No More Room In Hell.

This means that all Source mods, made for Valve games (we list around 1,500 for HL2 alone) may eventually be free to play, without requiring you to purchase a Valve game (thou who hasn't purchased a valve game on this site?)

Here is what Robin Walker had to say:

Robin wrote:Yep. That said, your email has triggered a process here that made us re-examine that, and we’re going to just go ahead and make the Source SDK freely available. Thanks for making us better!

When RockPaperShotgun emailed Walker for further confirmation, and he went on to explain:

Robin wrote:We are in the process of getting it all done. It’s a bit messy because we have multiple versions of the SDK, and there’s some dependencies we need to shake out. But yes, the gist of it is that we’re just going to go ahead and make the Source SDK freely available.

Nifty... share this great news!

Post comment Comments  (150 - 164 of 164)
jangsy5 Jul 6 2011, 8:46pm says:

Why are people getting angry at stuff getting cheaper? Or as a matter of fact becoming free? You bought the games at the price it was to be at that time deemed by the retailer. It was your choice to buy a WORKING product that you saw to be decent and fair buy. You chose on THAT DAY to lose your money to buy something. You spent your own money (unless someone else did, then stop whining) and gave it to another for something.

If you bought a mobile for $200 and it gets cheaper would you ask the retailer to refund your money back because it got cheaper?

If the game was full of crap I might want my money back. I bought hl2 for $30, now its almost $10 and I don't give crap because I already bought the game at the fair value that was for me (though I regret not being more patient), it got cheaper because of a sales move and/or the degrading value not because I was a sucker for the goods.

You people think you've been cheated out? Think again and Hard this time. You're complaining about a fallen apple that just hit you in the head. Besides Source SDK was free when it was first released. It just so happen to be HL2 exclusive just like Dead Nation (That's free) is exclusive only to PS. Now Source SDK is free to the open public. It doesn't mean you're games became worthless, it became worthless (legally) when you first bought them (that is if it's a legit steam game).

+7 votes     reply to comment
jangsy5 Jul 6 2011, 8:47pm replied:

Also you have to understand that source SDK had many versions for may of the source games. It was so disorganised and mostly out dated. They wanted to merge all the source codes into one organised set. Since TF2 becoming free and alien swarm (a full game technically a techdemo for the latest version of source sdk) it was a logical step towards making Source SDK completely free. It doesn't mean however that they'll get all assets from source game that they might not own, but that's a speculation because the free udk doesn't have all the assets from UT3.

So stop complaining how source SDK is free means the end of your lives, get over it there are far worse things that have happen to people who lost everything by people who wanted everything from that person.

Don't get me wrong here. I'm trying to point out that you people are angry about nothing. Also people who are just loving this think twice before you do something. You have to realise there are legal boundaries that shouldn't be crossed.

+4 votes     reply to comment
Katana_ Jul 7 2011, 9:21pm replied:

.../thank/ you for stating the what-should-be-obvious.

+2 votes     reply to comment
MrTambourineMan Jul 8 2011, 9:13am says:

Ok I see where this debate is going, let me tell you: I first bought HL1 in '99 (or something) for full price, lost it before steam came out and then bought it on steam at a sale. I bought HL2, EP1, Orange Box all at a full price, bought L4D1&2 at first sales (still almost full price)+ I bought 2 additional copies of L4D2 at sales as a gift for a couple of my friends. Do I regret it? **** no! Do I think that TF2 should be free? **** yes. I can't believe how childish some people here are, they simply don't want anyone getting something free because they payed a (rather small) price for it nearly half a decade ago.

+6 votes     reply to comment
SPY-maps Jul 9 2011, 6:01am says:

that the SDK will be for free, although i thought it was already possible to play Hl2 mods without having a valve game installed. Of course do these mods need to be total conversion, otherwise you will miss the models, npc's, sounds, etc that where taken from a vale game.

really interesting, and personaly i LOVE Hammer and the soruce engine. so i could imagen making a indie game with it!

really interesting news!!!!


+3 votes     reply to comment
Ice_Eyes Jul 9 2011, 12:58pm says:

-My mistake- :P

+1 vote     reply to comment
suttonmitchell Jul 10 2011, 11:08pm says:

The whole point of games going on sale is to reward people who wait, and to make more people begin to enjoy the games, if valve payed everyone back for every single game that has gone on sale, they would be bankrupt...

+2 votes     reply to comment
AmaroqDricaldari Jul 13 2011, 5:12am says:

Since all versions of Source SDK are now free, I hope they combine them into a single piece of software.

0 votes     reply to comment
Cremat0r Jul 17 2011, 2:45am says:

Not to sound dumb or something, but everyone should pay those great devs money, even if a very small amount as it already is, for this great engine + materials.

+1 vote     reply to comment
bioswat Jul 17 2011, 10:02am says:

Stop!Isn't SDK was free for all time?But you needed Source game for this...Or what?Do they mean ENGINE is free?

+1 vote     reply to comment
DedMustDie Jul 19 2011, 3:55pm says:


+1 vote     reply to comment
Megadave2003 Jul 25 2011, 9:26pm says:

I think people may be taking this out of context. This doesn't mean youll be able to play half-life 2 mods, but you will be able to make them.

+1 vote     reply to comment
Argoon Jul 29 2011, 2:50pm replied:

There's a fallacy on your comment, if you can make HL2 mods them you CAN play them. What this free sdk means, is just like UDK you will be able to make standalone TC's without the need of having another source game installed.

+1 vote     reply to comment
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