Hobbies & DIY

Open Music Theory is an open-source interactive online textbook for college-level music theory courses.

Chess Monitor analyzes players' games, openings, win rates, ratings, opponents and other statistics.

Fretastic displays guitar scales on an interactive fretboard, with CAGED positions and play-along tracks.

Visual History of Chessmen presents historical information about chess pieces, as indicated by its title and heading.

Use Helio Sequencer to create music on desktop or mobile; the project describes it as a free sequencer.

Tactic or Not trains chess pattern recognition with mixed tactical and quiet positions, daily puzzles and adaptive ratings.

Rubiks Cube Guide explains the 3x3 beginner method and CFOP, with notation and practice guidance.

The open-source Lucas Chess program supports chess training, play and competition.

My Fretboard Trainer teaches guitar notes, chords and intervals through quizzes, exercises and scale visualizations.

csTimer provides a Rubik's Cube speedsolving timer and training tools, with multilingual controls and help.

Cosumi lets users play Go in a browser without registering or installing software.

PianoCheetah provides piano practice and music playback tools, including a compact keyboard layout for playing songs.

Open Music Theory provides an online open educational resource and workbook for undergraduate music theory.

Midiano teaches piano with falling-note visuals and sheet music from MIDI files, with feedback from a connected MIDI keyboard.

BlindTrainer helps users practice commutators and algorithms for blindfolded cube solving, with drills and progress tracking.

This GitHub list collects papers, repositories and other data about anime and manga research.

FloobyNooby teaches storyboarding and visual storytelling, with lessons on cinematography and story artist techniques.

Listudy uses spaced repetition to help chess players study openings, endgames and tactics.

CubeSkills teaches speedcubing through lessons from Feliks Zemdegs, a two-time world champion.

RubiksTrainer teaches cube solving with beginner guidance, algorithm practice, recognition drills and a timer.

Ruwix covers Rubik's Cube and twisty puzzles with tutorials, an online solver, timer and simulators.

HamStudy provides study tools and practice questions for amateur radio exams in multiple countries.

SpeedSolving connects people who solve puzzles quickly, including Rubik's Cube fans.

qqTimer times Rubik’s Cube solves and records sessions, with scramble options and controls for penalties and timer settings.