So, Pathfinder has the vast majority of their information online here. It's incredibly helpful and really awesome that they have it online to browse, and anyone can begin playing it without needing to find a book, or downloading a pdf (often illegally).

My question is: What other RPGs offer, at the very least, the rules for character creation online for anyone to use?

~SE++

I don't see the issue with .pdfs, so I'm going to entirely ignore that part.

Nemesis — One-Roll Engine Horror Game
Fate — FUDGE Dramatic Game
Ars Magica 4th ED — d10 Mythical-Europe Wizardry Game
Mutants and Masterminds SRD — d20 Superhero Game

Less Serious Options

Everyone is John — d6 Competitive Disaster Simulator Game
Time Wizards — Dice-Slapping Wizardry Drinking Game
Lasers and Feelings — d6 Space Game
Car Lesbians — Exactly what it says

There's also no shortage of quickstarts that could probably get you to a point of playing a basic variant of the game, or at the very least through character creation.