Is it possible to download a previous version of minecraft_server.jar?

I am trying to set up a Tekkit-like server (+ some different mods). Most mods are not 1.4.2-compatible, yet, so the server runs 1.3.2. I can use MCNostalgia to downgrade the client, but is there any way to downgrade the server or download an old version?

http://assets.minecraft.net/ has all the Minecraft versions since the Beta 1.8 prereleases and until 1.5.2 inclusive.

To get the needed version of minecraft_server.jar, you replace the dots in the version name to underscores and download, for example, /1_3_2/minecraft_server.jar.

You can also get the exe server and the client there. For example:

/1_4_3/Minecraft_Server.exe
/12w32a/minecraft.jar

Since Minecraft 1.6 (and the release of a new launcher) the downloads have been moved to https://s3.amazonaws.com/Minecraft.Download/. Examples:

/versions/1.6.1/minecraft_server.1.6.1.jar
/versions/13w25c/minecraft_server.13w25c.exe
/versions/1.6.1/1.6.1.jar

I figured it out with Minecraft Version Changer (mcvc.in). It's a nice little Java app to download what ever version you please.

MCNostalgia (http://www.minecraftforum.net/topic/800346-tool-mcnostalgia) is the generally accepted way to downgrade your Minecraft version. It works based on binary diffs, recalculated on each update for all ~80 something versions archived -- hence it requires an unmodified .jar of the current version.

Some of the available really old versions include:

• indev-2-23-10
• infdev-6-18-10
• Alpha 1.0.4, .5_01, .11, .14, .15, .16, .17_02, .17_04
• Alpha 1.1.0, .2, .2_01

After about halfway through Alpha, pretty much every version is available.

If you want newer versions released since this question was asked, the previous answers no longer work, and now it is really easy.

Just open the launcher, create an installation for the version you wish to use, and edit it. There should be a button marked "Download Server", that will do just that.