They're not 100% MUST HAVE for everyone. But in my opinion, they're needed.



Skype
Skype can be used to video call/voice/text chat with your friends and family!
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Microsoft Office
Microsoft office is a program used to type up lots of important documents.
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Malware Bytes
I use this to prevent my computer getting infected from the sly ones.
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Photoshop CS6
I used Photoshop to create the thread title.
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Dropbox
I use Dropbox to quickly drag files to a PC in my house that's hooked to a printer.
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Google Chrome
Chrome is one of the best browsers out there and is used for a lot of different reasons.
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Steam
Steam is basically a directory for you to quickly launch and install games - you can also purchase games from the store.
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iTunes
iTunes is a program I use to compile all of my music into one big master list sorted by albums.
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Spotify
Music Program
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PowerISO
This is a very useful tool for burning ISO's to discs.
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Gyazo
Gyazo is a quick screenshot with straight upload.
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Puush
puush is an alternate screenshot program.
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Virtual Clonedrive
You can use this to mount ISOs onto a virtual HDD. (Not needed if your are on Windows 8 )
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Notepad ++
This is commonly used by coders - it's an upgraded version of the simple notepad.
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Winrar
I use Winrar to unpack archived files and to compress RAR documents.
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7-Zip
7-Zip is another alternative to Winra
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Speccy
Speccy is a tool that allows you to quickly see all of your PC's specs.
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CCleaner
This tool is used for cleaning up your PC through various ways!
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Advanced System Care
Advanced System Care is everything you need for a new PC.
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VLC Media Player
A multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.
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Have anything else to add, feel free to quote me!