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A collection of nine browser-native, fully accessible interactive tools for an introductory ordinary differential equations course at the sophomore level, typically taken by engineering, mathematics, and physical-science majors. The collection is distinguished from existing ODE visualization tools by three design choices. First, all tools run entirely in the browser with no installation, no account, no tracking, and full conformance to WCAG 2.1 AA — keyboard navigation, screen-reader-accessible mathematics through MathJax assistive MathML, high-contrast modes, and visible focus indicators on every interactive element. Second, the convolution tool is animated as the kernel function sliding over the signal while the overlapping area accumulates into the output in real time. This pedagogical treatment exposes what this transform actually does rather than presenting it as opaque computational rules. Third, the collection covers first-order dynamics (direction fields, phase lines, Newton's law of cooling), second-order systems (mass-spring damping across all three regimes, multi-degree-of-freedom coupled oscillators with normal modes and beats, forced vibrations with explicit transient and steady-state separation and resonance), and phase-plane analysis (linear portraits classified by eigenvalues, nonlinear portraits with nullclines and linearization-based stability) within a single consistent user interface, supporting transfer of skills across topics. All quantities are recomputed live from the underlying equations; no symbolic algebra system is hidden behind the visualization.

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