How to easily find big files in Windows 8/Mac OS X without third party software

I've been using my PC with Windows 8 and my Mac with OS X for a while. The available hard disk space is becoming less and less. So I need to find out which big files are consuming a lot of space (videos, installation packages) so that I can delete or move them. I prefer not installing any third party software. But if you do know any good third party cleanup tools, you may also let me know. Thanks!
condor888Asked:
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strungCommented:
Whatsize http://whatsizemac.com is the standard Mac software for finding where your disk space has gone.

I am leery of cleanup tools and prefer to do that by hand.

If what you want to do is clean out cache and log files, though Onyx http://www.titanium.free.fr/onyx.html works well and is free.
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condor888Author Commented:
Hi Ben, that's good article. So I'd like to find a similar solution on the mac without third party software.
@strung thanks for your software recommendation, but do you have a way without third party software to do the finding on the Mac?
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Scott CSenior Systems EnginerCommented:
For Windows...WinDirStat Portable.

http://download.cnet.com/WinDirStat-Portable/3000-2094_4-10836539.html

All you need is the executable on a flash drive and run it.  You get a 3rd party app but no install.
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strungCommented:
Here is a list of alternatives to WhatSize, some of which are free:  http://alternativeto.net/software/whatsize/?platform=mac but I don't think any work as well.
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strungCommented:
The best you can do without any third party software is to do a Spotlight search.

1. Open a Finder window

2. Type Command-F to open a search box in the finder window.

3.  Open the Kind pop-up menu, then choose Other.

4.  Under “Select a search attribute” select the checkbox for File Size.

5.  Change the “equals” pop-up menu to “is greater than,” then center a minimum file size.

Searching begins as soon as you type a file size. It may take a moment for all the search results to appear.

This has limitations as it won't show folders,  invisible or system files.  

Really, Whatsize is by far your best bet. There is a free downloadable demo.
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Ben HartCommented:
Crap sorry Condor.. I didn't see the Mac part.  Me not having one I'm of no use on that front.
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condor888Author Commented:
@Ben it's okay, i can accept multiple solutions.
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condor888Author Commented:
@strung the searching solution seems good. I am also curious about Whatsize. Is it a popular software under the Mac? Is it safe to install? Have you purchased that?

If I have several Macs, how many license should I purchase?
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strungCommented:
It is very popular. I have used it. It is perfectly safe.
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