#Disclaimer
Slopa is an indie project that relies on astonishing work done by programmers, designers, composers and everyone who chose to share their creations. Slopa respects intellectual property and tries to correctly attribute every piece of work used. If your work is used but you are not credited here, please contact credits@slopa.io and this page will be fixed.
#3D Framework
#Sokol by Andre Weissflog: github.com/floooh/sokol, license: zlib
#sokol-samples by Andre Weissflog: github.com/floooh/sokol-samples, license: MIT
#Graphics Backends
#WebGPU via Dawn by The Dawn & Tint Authors (Google), integrated through the emdawnwebgpu Emscripten port: dawn.googlesource.com/dawn, license: BSD 3-Clause
#Metal by Apple, used for the native build: developer.apple.com/metal
#Sky and Water
#Three.js Sky Pro by Dan Greenheck (DRG Software Solutions LLC): threejsroadmap.com/assets/threejs-sky-pro, license: commercial, purchased 2026-09-24 for hi@slopa.io (order #10627) from Three.js Roadmap. The sky, volumetric clouds, cloud shadows and moon are ported from it; the cirrus texture is its AI-generated example asset
#Three.js Water Pro by Dan Greenheck (DRG Software Solutions LLC): threejsroadmap.com/assets/threejs-water-pro, license: commercial, purchased 2026-09-24 for hi@slopa.io (order #10627) from Three.js Roadmap
#3D Models
#Dog: skfb.ly/6TKvt by Cyranek, license: Creative Commons Attribution 4.0
#Frog: skfb.ly/oyvGC by demidrew, license: Creative Commons Attribution 4.0
#Stylized Skeleton by Hot Strike Studio: hotstrikestudio.itch.io/free-stylized-skeleton, from itch.io
#KayKit: Dungeon Remastered Pack by Kay Lousberg: kaylousberg.com, license: Creative Commons Zero, CC0, purchased from itch.io
#KayKit: Halloween Bits by Kay Lousberg: kaylousberg.itch.io/halloween-bits, license: Creative Commons Zero, CC0, purchased from itch.io
#KayKit: Fantasy Weapons Bits by Kay Lousberg: kaylousberg.itch.io/fantasy-weapons-bits, license: Creative Commons Zero, CC0, purchased from itch.io
#KayKit: Bits Bundle 1 by Kay Lousberg: kaylousberg.itch.io/bits-bundle-1, license: Creative Commons Zero, CC0, purchased from itch.io
#KayKit: Bits Bundle 2 by Kay Lousberg: kaylousberg.itch.io/bits-bundle-2, license: Creative Commons Zero, CC0, purchased from itch.io
#KayKit: Character Pack Mystery Monthly Series 4 by Kay Lousberg: kaylousberg.itch.io/kaykit-series-4, license: Creative Commons Zero, CC0, purchased from itch.io
#KayKit: Character Pack Mystery Monthly Series 5 by Kay Lousberg: kaylousberg.itch.io/kaykit-series-5, license: Creative Commons Zero, CC0, purchased from itch.io
#KayKit: Character Pack Mystery Monthly Series 6 by Kay Lousberg: kaylousberg.itch.io/kaykit-series-6, license: Creative Commons Zero, CC0, purchased from itch.io
#Low Poly Tree Pack by Arludus: arludus.itch.io/lowpolytreepack, purchased from itch.io
#Modular Village Pack by Keith (Fertile Soil Productions): fertile-soil-productions.itch.io/modular-village-pack, license: Creative Commons Zero, CC0, from itch.io
#Ultimate Animal Pack by WildMesh: patreon.com/wildmesh, purchased from Patreon
#Stylized Medieval Village by JustCreate: cgtrader.com/3d-models/exterior/other/stylized-medieval-village, license: Royalty Free, purchased from CGTrader
#Low Poly Medieval Village by JustCreate: cgtrader.com/3d-models/exterior/landscape/low-poly-medieval-village, license: Royalty Free, purchased from CGTrader
#Full Mongol Warrior Costume Outfit by 3dia: cgtrader.com/3d-models/character/clothing/full-mongol-warrior-costume-outfit, license: Royalty Free, purchased from CGTrader
#Ancient Generic Clay Houses Building Desert Egypt AAA Collection by Enterables: cgtrader.com/3d-models/exterior/house/ancient-generic-clay-houses-building-desert-egypt-aaa-collection, license: Royalty Free, purchased 2026-08-20 from CGTrader
#Simple Trees Pack Bundle by LetsMakeCoolArt: cgtrader.com/designers/LetsMakeCoolArt, license: Royalty Free, purchased 2026-08-21 from CGTrader
#Torch fire - vdb animated by Cheekz: cgtrader.com/3d-models/textures/natural-textures/vdb-torch-fire, license: Royalty Free, purchased 2026-09-01 from CGTrader
#Mongol Helm: skfb.ly/6TqN7 by kaukatart, license: Creative Commons Attribution 4.0
#Neko girl RIG: skfb.ly/orWGu by lorex, license: Creative Commons Attribution 4.0
#Ultimate Nature Pack by Quaternius: quaternius.com/packs/ultimatenature.html, license: Creative Commons Zero, CC0
#Low Poly Western Desert Asset Pack by dglopez: dglopez.itch.io/low-poly-western-desert-asset-pack-30-free-models, license: free for personal and commercial use, from itch.io
#Medieval Catapult: skfb.ly/pCuOw by Bagadanga, license: Creative Commons Attribution 4.0
#Dark Gothic Fantasy Castle City by CharlotteUA: cgtrader.com/designers/CharlotteUA, license: Royalty Free, purchased 2026-08-25 from CGTrader
#Medieval Ancient Castle Ruin Ruins Walls Tower Wall Collection by Enterables: cgtrader.com/designers/Enterables, license: Royalty Free, purchased 2026-08-25 from CGTrader
#Medieval Architecture Kit by Lunarsong: github.com/Lunarsong/medieval-architecture-kit, license: MIT
#Modular Medieval Village - Unreal Project by manufacturak4: cgtrader.com/designers/manufacturak4, license: Royalty Free, purchased 2026-09-06 from CGTrader
#Pirate town by korboleevd: cgtrader.com/designers/korboleevd, license: Royalty Free, purchased 2026-09-06 from CGTrader
#60 Female hand poses by corsair95: cgtrader.com/designers/corsair95, license: Royalty Free, purchased 2026-09-20 from CGTrader
#Assassin - Game Ready character wearing cloak by mooncat-3d-models, purchased 2026-10-01 from CGTrader
#Ripper ghost by dremorn, purchased 2026-10-02 from CGTrader
#Moss Tileable Material with Substance Graph by LetsMakeCoolArt, purchased 2026-10-02 from CGTrader
#Vine Plants Pack by LetsMakeCoolArt, purchased 2026-10-02 from CGTrader
#Stylized Grass Pack by LetsMakeCoolArt, purchased 2026-10-02 from CGTrader
#Nemesis - Game Ready angel by mooncat-3d-models, purchased 2026-10-02 from CGTrader
#Fallen Knight Shadow Assassin by Tempest-Studio-Labs, purchased 2026-10-02 from CGTrader
#Lord Shiva - 10 Hands by escultura-digital-3d, purchased 2026-10-02 from CGTrader
#Minotaur Warrior Character Pack by khedria34, purchased 2026-10-02 from CGTrader
#Medieval Castle Kit by RenderCrate (ProductionCrate): rendercrate.com/objects/RenderCrate-Medieval_Castle_Kit, license: ProductionCrate Extended Use License, from RenderCrate
#Music
#S.I.G.N.A.L (Dark Emotional Cinematic Music) by EpicOrderSounds: booth.pm/items/8528529, license: free for personal and commercial use
#Dark Epic Synthwave Music by EpicOrderSounds: epicordersounds.itch.io/free-music-dark-epic-synthwave-music-royalty-free, license: free for personal and commercial use, from itch.io
#Vetur Frosti by Alexander Nakarada (CreatorChords): creatorchords.com, royalty free music by free-stock-music.com, license: Creative Commons Attribution 4.0
#AI-generated via Suno: suno.com, license: commercial use rights for songs made while subscribed
#Sound Effects
#Footsteps, water and coins: field recordings from Freesound, sliced by Tidewater, license: Creative Commons Zero, CC0
#Footsteps_Grass_1.wav by SilentStrikeZ: freesound.org/people/SilentStrikeZ/sounds/389625, license: Creative Commons Zero, CC0
#Soft sand steps.wav by 200221-WeanBekker: freesound.org/people/200221-WeanBekker/sounds/543714, license: Creative Commons Zero, CC0
#footsteps in wet coarse sand.wav by bruno.auzet: freesound.org/people/bruno.auzet/sounds/539175, license: Creative Commons Zero, CC0
#Footsteps - Stone, Rock, Concrete, Cement by SecureSubset: freesound.org/people/SecureSubset/sounds/813622, license: Creative Commons Zero, CC0
#Footsteps on hollow wood by florianreichelt: freesound.org/people/florianreichelt/sounds/459970, license: Creative Commons Zero, CC0
#Footsteps_Walk.wav by Nox_Sound: freesound.org/people/Nox_Sound/sounds/490951, license: Creative Commons Zero, CC0
#Wading in Shallow Water.wav by ryansitz: freesound.org/people/ryansitz/sounds/342932, license: Creative Commons Zero, CC0
#SPLASH (by blaukreuz) by qubodup, an edit of 130723_Brela_HarborJump_F_4824.wav by blaukreuz: freesound.org/people/qubodup/sounds/212143, license: Creative Commons Zero, CC0
#Foley_Natural_Water_Jump_Mono.wav by Nox_Sound: freesound.org/people/Nox_Sound/sounds/585744, license: Creative Commons Zero, CC0
#Water Splash by felix.blume: freesound.org/people/felix.blume/sounds/434978, license: Creative Commons Zero, CC0
#coins - in paper bowl 05.wav by Anthousai: freesound.org/people/Anthousai/sounds/336585, license: Creative Commons Zero, CC0
#Skeletal Animations
#Mixamo by Adobe: mixamo.com, license: royalty-free use per the Mixamo terms
#Spell Effects
#Elemental Sandbox spells by Chiro Visuals (mohamedachrefelouafi): x.com/chirovisuals, three packs: LinearAbiltyCastingExtendedThreeJS, LinearAbilityExtThreeJS and HandCastAbilityThreeJS, license: MIT. The Astral Void Blast, Celestial Rend and Arborist's Growth ultimates are ported from them
#Programming Languages
#C by Dennis Ritchie
#TypeScript by Microsoft: typescriptlang.org, license: Apache License 2.0
#Compiler Toolchain
#Emscripten, emsdk by Alon Zakai and contributors: emscripten.org, license: MIT / University of Illinois NCSA
#Operating System
#Linux by Linus Torvalds and many more contributors: kernel.org, license: GPLv2
#General Libraries
#stb by Sean Barrett: github.com/nothings/stb, license: MIT / public domain
#fontstash by Mikko Mononen: github.com/memononen/fontstash, license: zlib
#HandmadeMath: github.com/HandmadeMath/HandmadeMath, license: CC0 1.0 Universal
#iqm (Inter-Quake Model) by Lee Salzman: github.com/lsalzman/iqm, license: MIT
#Fast-Quadric-Mesh-Simplification by Sven Forstmann: github.com/sp4cerat/Fast-Quadric-Mesh-Simplification, license: MIT
#naett by Erik Agsjö: github.com/erkkah/naett, license: MIT
#sjson by Sepehr Taghdisian: github.com/septag/sjson, license: BSD 2-Clause
#Technique References
#Cape physics reference by Victor Zakharov: github.com/VictorZakharov/cape-physics, license: MIT. Cape SLEEP idea was adapted
#Advanced Character Physics by Thomas Jakobsen (GDC 2001): cs.cmu.edu/.../Jakobsen.pdf. The velocity-less Verlet step and relaxation-based constraint solving the cape simulation is built on
#Position Based Dynamics by Matthias Müller, Bruno Heidelberger, Marcus Hennix and John Ratcliff (VRIPhys 2006): matthias-research.github.io/pages/publications/posBasedDyn.pdf. The constraint projection model used for cloth
#XPBD: Position-Based Simulation of Compliant Constrained Dynamics by Miles Macklin, Matthias Müller and Nuttapong Chentanez (MIG 2016): matthias-research.github.io/pages/publications/XPBD.pdf. Compliance, so cloth stiffness no longer depends on the iteration count
#Small Steps in Physics Simulation by Miles Macklin, Kier Storey, Michelle Lu, Pierre Terdiman, Nuttapong Chentanez, Stefan Jeschke and Matthias Müller (SCA 2019): mmacklin.com/smallsteps.pdf. The cape solver spends its budget on substeps instead of solver iterations because of this paper
#Long Range Attachments: A Method to Simulate Inextensible Clothing in Computer Games by Tae-Yong Kim, Nuttapong Chentanez and Matthias Müller-Fischer (SCA 2012): matthias-research.github.io/pages/publications/sca2012cloth.pdf. The tether constraint that keeps a cape from stretching away from its collar
#Fast Simulation of Inextensible Hair and Fur by Matthias Müller, Tae-Yong Kim and Nuttapong Chentanez (VRIPhys 2012): matthias-research.github.io/pages/publications/FTLHairFur.pdf. Follow-The-Leader, the single-pass solver used for hair and fur strands
#TressFX by AMD (GPUOpen): gpuopen.com/tressfx, license: MIT. The local and global shape constraints that keep a hair groom from collapsing
#Foot IK: the ozz-animation foot_ik sample by Guillaume Blanc: guillaumeblanc.github.io/ozz-animation/samples/foot_ik, license: MIT, and Matching feet to terrain using IK: gamedev.net/blogs/entry/2264506-matching-feet-to-terrain-using-ik
#Effective Water Simulation from Physical Models by Mark Finch, GPU Gems chapter 1 (NVIDIA): developer.nvidia.com/gpugems/gpugems/part-i-natural-effects/chapter-1. The Gerstner swell that displaces the water surface
#Tidewater by Dan Greenheck (DRG Software Solutions LLC): github.com/dgreenheck/tidewater, license: MIT. Sun specular, soft sun shadows, grass gust sheen and several audio touches are adapted from it
#Box3D by Erin Catto: github.com/erincatto/box3d, license: MIT. An algorithm reference for the cape physics
#Inspiration
#The Max-Level Player's 100th Regression, a manhwa by Yeoun, Kingsoda and Duck_F, published in English as The 100th Regression of the Max-Level Player: tapas.io/series/the-100th-regression-of-the-max-level-player-comic. The look of the in-game UI popups is inspired by it
#Fonts
#Roboto by Christian Robertson (Google): fonts.google.com/specimen/Roboto, license: Apache License 2.0
#Texture Packs
#99proceduralvol01 by juliovii: juliovii.itch.io/99proceduralvol01, purchased from itch.io
#3D Modeling
#Blender by the Blender Foundation: blender.org, license: GNU GPL
#AI Assistance
#Claude by Anthropic: claude.ai, used to assist with math, programming, debugging and to provide overall technical insights into optimization techniques
#CDN
#Cloudflare Pages by Cloudflare: pages.cloudflare.com