Every student list on the internet recommends the same ten tools and forgets to mention which ones wall their best features behind trials. We built this list backwards: start from a semester of real student work, then find the free tier that survives it. These seven tools earned their rows in October 2026 testing, and every one runs without a card. The final section shows how they chain together into one study system, because the tools are free but the system is the actual cheat code.