FreeCalc

A free TI-84 graphing calculator for Windows. No install required — just run the .exe.

What's included in v0.3:

• Scientific calculator with full expression history
• Graph up to 6 simultaneous functions with trace, tangent, roots & intersect
• Unit converter (8 categories, ~55 units)
• Equation solver (linear, quadratic, polynomial, systems)
• Table of values with CSV export
• Graph export as PNG

Requirements: Windows 10 or later