rm's F-droid repo

Acidulous is a music studio for your phone. Combine synthesizers, drum machines, noise generators and processors into scenes, then play them in order or pick and choose to make something new every time. It's an homage to Caustic, with plenty of other inspirations and some ideas of its own.

• Machines including an acid bass, poly and FM synths, an organ, pads, a chip synth, modelled pianos, jaw harps, harmonicas and accordions, strings, brass and woodwinds, drum machines, samplers, granular, a singing voice, a vocoder, a modular synth and a four-track
• Effects with two inserts per track, send buses, groups and sidechain
• Scenes, a clip launcher, piano roll and drum grid, automation, step locks, probability and ratchets
• Scales, chords, arps, swing and alternate tunings, including Scala files
• MIDI in and out over USB and Bluetooth, MPE, Ableton Link and MIDI clock
• Perform pages for playing a song live
• Export WAV, AIFF, FLAC, MP3 or AAC, whole songs or stems, plus MIDI files and shareable song bundles
• Works with TalkBack, and has a high contrast theme
• A full manual in the app
• In English and Canadian French

Apogee is a physics sim. Build vehicles out of parts and take them wherever you want: on land, in the air, in space, and in and under the sea. Make rockets, planes, rovers, boats, submarines, helicopters, drones, balloons and airships, and found bases on the ground, on the water or in the sky.

• A solar system with planets and moons, each with its own gravity, air, weather and ground
• A launch complex, an airfield and a harbour to start from
• Staging, stability assist, planned burns and an autopilot for burns and landings
• Waves that move what floats on them, storms, currents and a world under the sea
• Bases with pads, power and industry that makes propellant from ore and water
• Named crew who walk on other worlds, plant flags and can be rescued
• A career where feats unlock parts, or free play with everything from the start
• Multiplayer over your network, or on a dedicated server for a persistent world

BlokHead is an Android port of Blokout, the open source 3D falling block game based on the classic Blockout. It plays the way the original does, with tweaks to make it more customizable and quicker to play.

• Blocks move in 3 dimensions and rotate around the X, Y and Z axes
• Three block sets: flat, extended, and the full original Blokout set
• On-screen d-pad and rotate buttons you can resize, move, fade or flip for left-handed play
• Gesture controls: drag to move, twist or slide two fingers to rotate, long press to drop
• Bluetooth and USB controllers with remappable buttons
• Adjustable well size, depth and starting difficulty
• High score table and sound effects

No network access.

Infill is a city builder seen from above. Start a township in 1900 with dirt roads and wells, and build it up through the streetcar city, the motor age, renewal and infill, as each era brings its own buildings, its own problems and its own way of doing things.

• Zones for homes, shops, offices, works and farms, from rural lots to towers
• Roads, junctions and traffic you can watch, plus rail, trams, buses, trolleybuses and a subway
• Power stations from coal to wind and storage, water, sewers, storm drains and garbage
• Police, fire, schools, health, civic buildings, and parks, sport and culture
• Ordinances, bonds and a credit rating, and an overseer if the debt gets out of hand
• Public opinion, petitions, grants, protests and elections
• People who age, go to school, move, get priced out and fall ill, and land that changes
• Weather, seasons, floods, droughts, fires and the odd disaster
• A chronicle of the town's story in the papers of each era
• Plays with touch, a keyboard or a controller, and works with TalkBack
• A full manual in the game

No network access.

MP3toMIDI is a proof of concept: it splits a song into 6 stems with Demucs, finds the notes and drum hits in each stem, and writes a MIDI file. The results are experimental, often busy, but the original song is usually recognizable. Conversions take 10 minutes or more on a midrange device.

• Splits songs into drums, bass, vocals, guitar, piano and other stems
• Polyphonic note detection with Spotify's Basic Pitch; hit-by-hit drum detection
• Detects tempo, and guesses each stem's instrument with YAMNet
• Accepts MP3, WAV, FLAC, AAC, OGG, Opus and anything else Android can play
• Review each stem's instrument, confidence and note count before writing the file
• Keeps converting in the background; cancel any time
• Built-in MIDI player with soundfont playback, including your own .sf2 files

The Demucs and YAMNet models are downloaded once on first use; after that it works offline.

ParrotMetric is a parametric 3D modeller for your phone or tablet. Draw sketches with constraints and dimensions, turn them into solids, then round, cut, shell, pattern and join them into parts. Every step stays in the history, so you can change an early one and everything after it rebuilds.

• Sketches with lines, rectangles, circles, arcs, polygons, slots, ellipses, conics, splines and text, plus SVG and DXF drawings and pictures to trace over
• Extrude, revolve, sweep, loft, pipe and coil, or start from a box, cylinder, sphere, torus or cone
• Fillets, chamfers, shells, drafts, holes, ISO threads, press pull, ribs and webs, and emboss onto flat or curved faces
• Mirrors and patterns of bodies or of the steps that made them
• Parameters and configurations for versions of a part
• STL, 3MF and OBJ meshes that come in repaired and can be cut, joined, reduced and smoothed
• Surfaces, and components with joints that turn and slide
• Print check for overhangs and thin walls, zebra and curvature views, section, measure with weights for common filaments
• Export STL, 3MF, OBJ, STEP and IGES, and import STEP and IGES as solids
• A projects folder to keep designs the same on every device, through a sync app or a WebDAV server such as Nextcloud
• Touch, mouse and keyboard, with a layout for phones and one for tablets

ScaleInKey shows you the notes and chords in various modes and scales, and includes a simple chord progression sequencer with looping and adjustable BPM.

• 33 scale types: modes, minor, pentatonic, blues, world, jazz and symmetric scales
• Diatonic chords as triads or 7th chords
• Piano, Guitar, Ukulele and Bass diagrams, with a chord-box fingering chart mode
• Tap-to-hear playback through a real SF2 synth; load your own .sf2 soundfont
• Chord progression sequencer with BPM, beats-per-chord and looping

ScorchDroid is an Android port of Scorched3D, the 3D artillery game based on the classic Scorched Earth. It runs the real Scorched3D engine, so weapons, terrain, wind, shields and bots work exactly as on desktop, with a UI rebuilt for touch.

• Scorched3D's graphics, particle effects, sound and music
• Touch controls with sliders for angle, elevation and power, and seven camera views
• Multiplayer over Wi-Fi, hotspot, Wi-Fi Direct or Bluetooth, with automatic game discovery
• Join desktop Scorched3D servers and play with people on PC
• Play in a browser too, and play with browser players on a dedicated server
• In-game chat, live score table and host admin controls

SnapRacers is a kart racing game where you build your kart out of bricks and parts and race it. Every part changes how it drives, adding weight, drag, power or grip, and crashes knock parts off until you reset.

• Nearly 200 parts, from plates and curved slopes to engines, wings, wheels and motorbike frames
• 22 stock karts, bikes and trikes if you'd rather not build
• Nine Grand Prix cups and 36 courses traced from real kart tracks, race circuits and roller coasters
• Power-ups on the track, sliding around corners and scenery that breaks
• Seven AI drivers at four levels, and brick figure drivers you build yourself
• A track editor, your own cups, and sharing courses and cups as a code or a file
• Two players on one phone, or online over Wi-Fi, Wi-Fi Direct, Bluetooth or a server
• Touch, keys or a controller, and all its sound and music made for the game