Garry’s Mod (G-Mod) Wire Tutorials

 Here are several useful and popular downloads for Garry’s Mod. Several of these addons are updated frequently so they use an updating protocol called SVN for subversion. The best client for svn is TortoiseSVN (http://tortoisesvn.tigris.org/). Below is a guide from Wiremod Forums on how to use it (http://www.wiremod.com/forum/wiremod-general-chat/4-wiremod-svn-guide.html):

1. Get a suitable SVN client like Tortoise SVN
2. Make sure you remove the “wire” folder from inside your addons folder
3. If you have Tortoise SVN, right click the addon folder in your garrysmod folder and choose “SVN Checkout”
4. Enter this address: “https://svn.wiremod.com/svn/wiremod/” If prompted for a username and password use anonsvn for username and anonsvn for password.
5. Press OK
6. After the download completes, delete the “.svn” database folder located in addons (not the ones in any subfolder, JUST the one in addons!). Note the folder is marked as hidden, you need to enable “Show hidden files and folders” in your OS to see it. This is not a critical step, and you can skip it if you wish, but if any other mod uses the “checkout to addons” method, this ensures it stays clean and no conflicts arise. Don’t worry, the three or so wire folders that came from the Repository have their own “.svn” folders to keep track of their respective folders .

~~~SVN~~~
Wiremod:            https://svn.wiremod.com/svn/wiremod (Adds tools that allow for complex creations)
Wire2:                 https://svn.wiremod.com/svn/wire2 (dunno… seems interesting)
Wiremod Extras: http://svn.dagamers.net/wiremodextras/trunk (Various extras for wiremod)
PHX3:                 https://phoenix-storms.svn.sourceforge.net/svnroot/phoenix-storms (Useful props)
Ulx:                    http://ulyssesmod.net/ulx/trunk (Admin Mod)
Ulib:                  http://ulyssesmod.net/ulib/trunk (Libraries for the above mod)
Stargate:            https://svn.wiremod.com/svn/stargate/trunk/addons/ (Adds weapons and the stargate from the show Stargate-SG1)

SBMP:                http://spacebuildmodelpack.googlecode.com/svn/trunk/SpacebuildModelPackAlpha2 (Adds props which are useful for building spaceships)
LS3 Pack:          http://customaddons.googlecode.com/svn/trunk (Includes Life Support 3, Resource Distribution 2, and some other addons. Make sure to move it’s contents to addons)
LS3 Gas:            http://svn.assembla.com/svn/gassystems2/ (Adds gas generators, storage, and thrusters)
LS3 CAF:           http://customaddonframework.googlecode.com/svn/trunk/Custom%20Addon%20Framework/ (Required by LS3)
SB3 Beta:           http://spacebuild.googlecode.com/svn/trunk/ (The Spacebuild 3 gamemode)

~~~Non-SVN~~~
Notepad:               http://garrysmod.org/downloads/?a=view&id=29694 (execute “notepad” in console to use it. Useful for making expressions.)
Measure stick:       http://garrysmod.org/downloads/?a=view&id=37778 (Give you the units between the two points you click)
Stacker:                  http://garrysmod.org/downloads/?a=view&id=29854 (Copies a prop and pastes it in the direction you specify.)
Smart Constraint:  http://garrysmod.org/downloads/?a=view&id=22203 (Select multiple props then weld and/or nocollide them)
Smart Snap:           http://garrysmod.org/downloads/?a=view&id=35405 (Makes a grid which you can snap to and then accurately place things)