If you're cheap like me, you want good free stuff. Here's a list of all my favorite good free things.
Bitmap/Raster Graphics: Paint.NET, Gimp
Vector Graphics: Inkscape
Online bitmap/PDF/.sketchpad (whatever that is): Sketch.io Sketchpad
Clean interface with a few non-intrusive ads (no account required): Cubeupload
Professional-looking host with a few ads (needs account): Photobucket
In-browser or offline, automatic uploading: Lightshot
Offline only, also takes animated GIFs: Gyazo (NOTE: I gained a virus soon after installing this. However, nobody else has had issues. Most likely safe, but be careful.)
Windows-only, no automatic upload: Snipping Tool (Most likely came with Windows)
Mac-only, no automatic upload: CMD+SHIFT+4 and select area
Free game art and sounds: OpenGameArt
Popular & Often-used: Youtube
Less comments, more video: Vimeo
Also has minor editing ability: VLC
Difficult to use, tons of options and features, no watermark: OBS (Open Broadcaster Software) (Also does live-streams)
Easy to use, not many options, has watermark: Bandicam
3D Keyframe animation (and modeling): Blender
Difficult to use, all-you-can eat buffet of features: Lightworks (There is a paid version of lightworks. Just get the free one. See the blue "Lightworks Free" header on the homepage.)
Easy to use basic features: Windows Movie Maker, iMovie (comes free with mac computers)
(And also spreadsheets, presentations, etc. Basically free Microsoft Office.)
Full-featured online editor with auto-save, live multi-person editing, and more: Google Docs (Also known as Google Drive. Docs and drive aren't technically the same thing, but they pretty much are. I don't understand either.)
Offline Editor: LibreOffice
Code for the front-end web (HTML, CSS, JS, etc): Brackets
Online JS/HTML/CSS: JSFiddle, Codepen
General Code (all languages): Atom, Sublime Text, [Notepad++] (https://notepad-plus-plus.org)
Beginners' Lanuage and Editor: Scratch (Great community for kids)
Windows: Cmder
OS X: iTerm2
Sheet Music: MuseScore
Text-based music making: Lilypond
Chiptune/8-bit: Famitracker
Online Sheet Music: flat.io, Noteflight
Digital Audio Workstation (DAW): LMMS
A free and public domain library: IMSLP.org
Easy-to-use compressor: 7zip
Add Google Chrome-style tabs to the Windows file explorer: Clover
Free, no ads and student friendly: Gwiddle
Free, has addons and elements to make setup easy heroku
Free and fast hosting with no backend: GitHub Pages