Tools
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Gaussian Elimination Practice
Row reduce a matrix to REF or RREF one row operation at a time, with hints and a record of every step.
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Gmail Link Converter
Turn a Gmail link that uses an account number (like /u/0/) into one tied to the account's email address.
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Hanon Piano Exercises
Hanon's piano exercises 1–20 in any key, mode, and practice rhythm, with fingering, playback, and printing.
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LaTeX to Unicode Converter (UnicodeIt)
Turn LaTeX math like \alpha^2 \leq x_{12} into plain Unicode text (α² ≤ x₁₂) for emails, chats, and code comments.
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Multi-note Music Tuner
A tuner and live spectrum analyzer: see the frequencies in the sound from your microphone, which notes they are, and how many cents sharp or flat each one is.
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Note Quality Analyzer
Play or sing one note at a time and see how steady its pitch and volume are, how warm or thin its tone is, and how cleanly it starts and ends.
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Paul's LaTeX Macro Replacement Tool
Rewrite generic LaTeX to use my personal macros, with options for math delimiters and Anki cloze tags.
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Periodic Activity Logger
Check in at regular intervals: what you were doing, what you should be doing, and what's next, and append to a log file.
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Pun Finder
Search for words with matching or similar sounds based on their phonetic similarity.
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REF/RREF Study Tool
Check whether a matrix is in row echelon form (REF) or reduced row echelon form (RREF), see which conditions fail, and quiz yourself on random matrices.
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The Physics of a Bowed String
Watch a simulated violin string stick to and slip past the bow, see the Helmholtz corner travel along it, hear the result, and map which bow forces and positions produce a good tone.