Move Space Hogs Elsewhere (Without Affecting Anything)
While this doesn't free up overall disk space, it's helpful if you need to relocate a large chunk of files from one drive to another drive without affecting anything. An example: your C:\ drive is running out of space and you find that your games on Steam are the culprit. However, you don't want to uninstall then reinstall them because that'll take forever.
Running with this example, here's what you can do:
1. Make sure Steam is closed.
2. Go to C:\Program Files (x86)\Steam
3. Move the "steamapps" folder to where you want to store it.
4. Open Command Prompt as an Administrator
a. Go to Start > All Programs > Accessories. Find Command Prompt and right click it. Select "Run as administrator"
b. Open Start and pull up search. Type in "cmd" and it should be displayed in the results. You can either right-click it and select "Run as administrator," or if it's highlighted, press CTRL + Enter.
5. Type cd "C:\Program Files (x86)\Steam" (the path must be in quotes)
6. Type mklink /J steamapps [your path to steamapps]
a. So, if I moved steamapps to D:\Games\steamapps, the command would be:
mklink /J steamapps D:\Games\steamapps
To generalize the above:
1. Move the folder that you want to relocate.
2. Open a command prompt as an administrator
3. Navigate to where the folder was by using cd [path]
4. Then type the command mklink /J [name of folder] [new path of folder]
What about Linux?
Linux has a CCleaner-like tool called BleachBit (http://bleachbit.sourceforge.net/). It works similarly to CCleaner in that it looks for temporary and other files that may be of no use generated by programs like web browsers. However, when you run the program, you'll have to manually select the categories of files you want cleaned up. But after that, one button press takes care of the cleanup for you.
BleachBit in action.
Linux also has an app similar to WinDirStat called KDirStat. Much like WinDirStat, you select which parts of the drive you want to scan and a graphical representation of the file's sizes will be displayed.
If you're having trouble with the download and/or install of either app from the links we provided, check your distribution's package manager.