7zip: Basically WinZip, but better in almost every regard. And it's still free!
Ninite: Website that allows you to add/update most of these programs to a fresh PC. Obviously not a program, but useful given this thread's content.
Patch My PC: Pretty much the same as Ninite, will install most programs from this list.
Recuva: File recovery tool. The perfect thing for when you accidentally delete your report 2 hours before it's due.
QTTabbar: I have been informed that Clover is unstable on Win10 and can trigger antivirus software. This is the recommended alternative.
XYplorer Free: Another File Explorer upgrade tool. Adds a bunch of cool features.
Agent Ransack: Freeware with very powerful search tools (filtering, boolean expressions, etc) and a paid upgrade to FileLocator Pro.
Listary: Alternative to Everything for file searching. Very powerful and free.
Everything: Instant computer searching. Much better than the default Windows search.
The Three Commanders: Reddit comment to take you to one of three "Commander" programs. Each program is an upgrade to the File Explorer software for Win/OSX/Linux. Bunch more features and shit.
Free Commander: Like Total Commander but with more features.
UBlock Origin: Available in your browser's extension store. Free, of course. It's pretty much AdBlock, but does a whole lot more. Make sure you get Origin, though.
Kik Usernames: Search for Kik Usernames
RES: Reddit Enhancement Suite. If you're using Reddit without this, you're really missing out. It adds a shitton of features and it'll ruin vanilla Reddit for you.
PeerBlock: Free software to block connections coming to/from your computer.
NoScript: Addon for Mozilla browsers (Firefox) that blocks scripts (like JS) from running on non-whitelisted sites. Kinda like Adblock, but for scripts.
ProxMate: German add-on/extension to access geoblocked content (like YouTube), is pay to use.
Wiki: The Wiki of Hatred
ESET antivirus software licensed by Harvard for FAS students (and employees) to use on their personal computers (Windows or OS X) for free
Bitdefender: Helps you to not get viruses.
Malwarebytes: Helps you to get rid of the viruses that BD missed. There is a paid version, but the free ver is pretty good.
Hitman Pro: An antivirus software with a whole host of awesome features and a 30 day free trial. The three year license only costs $50US and it's a product from SOPHOS, so you know it's good shit.
Musicbee: Like iTunes, but you know, better. Because it's not iTunes.
VLC: Free media player, works pretty well. Some people like it, others don't.
KMPlayer: Free multimedia player, stock version is better than stock MPC-HC, would recommend.
Audacity: Audio recording software, I used it for a little bit and there's so much cool shit you can do with it! Definitely recommend it. Also, it's free!
Kodi: Free and Open Source home theatre software.
Unity: Free game engine. Easy-ish to pick up and use with a shitton of tutorials.
Unreal Engine: Another free game engine. Lots of documentation and easier to pick up, but you pay 5% royalties to Unreal when you make money from UE-based games.
Steam: Largest online video game retailer. Desktop app allows you to organise your library of games and play them at any time. But you already knew that.
Origin: Like Steam, but for EA.
Unturned Items ID: A list of all item ID's for the Steam game Unturned
GOG Galaxy: Again, similar to Steam. Owned by GOG.com (formerly Good Old Games), GOG-G is a store that
is was almost entirely dedicated to the old games. They still sell the classics but also sell more modern video games. All the games are also DRM free. Owned by CD Projekt (CDP Red is the dev team behind The Witcher series)
Teamspeak 3: Voice Over IP program that allows you to set up a server (most people pay a company to host for them) for people to connect to and chat on. Used by online gamers around the world.
Discord: Similar to TS3, but has a browser and phone app and is entirely free to use.
Mumble: Another VoIP program like TS3 with purchasable servers. Haven't used it but have heard good things about it.
Ventrilo: Free and lightweight VoIP program, looks pretty good.
Gimp: Free photoshop (Not as powerful as photoshop, but still very useful)
Paint.NET: More powerful version of MSPaint
Inkscape: Free vector-based graphic design software. I haven't used it, but I have heard a lot of good things about it!
Blender: Free, open source 3D modelling software. It's got a lot of cool features but is a tad hard to first get into.
Krita: Free drawing software with a bunch of cool features.