Open source focus

Open Source Alternatives to Just Slots

23 open source Gaming options similar to Just Slots, ranked by named competitors first, sector overlap, and our 0-100 AI-readiness score. Every company listed publishes its source: each one carries an open source sector tag and a public GitHub repository.

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Ubuntu70
Operating SystemsLondon, United Kingdom$63.0M
A popular open-source Linux distribution.
Open source · Self-hostable
Codefresh62
EnterpriseBrisbane, Australia$42.0M
Octopus Deploy provides a unified platform for continuous delivery, automating deployments, runbooks, and operations for modern applications.
Open source · Self-hostable
Appwrite58
EnterpriseSan Francisco, United States$37.0M
Open-source backend-as-a-service platform for building scalable applications.
Open source · Self-hostable
MetalBear56
Software DevelopmentSan Francisco, United States$12.5M
Open-core company building tools for modern backend engineers to ship faster and better.
Open source · Self-hostable
Odigos56
Enterprise$13.0M
Open-source project for instant distributed tracing and metrics using eBPF and OpenTelemetry.
Open source · Self-hostable
KiloClaw54
Artificial Intelligence
A managed, private, and production-grade environment for OpenClaw, offering access to over 500 AI models and essential tools.
Open source · Self-hostable
Comfy Org53
AI Image Generation$30.0M
Comfy is an AI creation engine for visual professionals, offering granular control over AI models, parameters, and outputs through a node-based workflow on an infinite canvas.
Open source
TanStack50
Software DevelopmentSan Francisco, Canada$1.0M
Developer tools for building modern web applications.
Open source · Self-hostable
All-Hands AI49
Agentic AIBoston, United States$5.0M
An open-source platform for building and running AI coding agents that automate software development tasks.
Open source · Self-hostable
Heroic Labs47
GamingLisbon, Portugal
Social infrastructure for games, makers of Nakama game server.
Open source · Self-hostable
Open Source Endowment45
Open SourceSan Francisco, United States$750K
A nonprofit endowment aiming to permanently solve the funding problem for open-source software maintainers.
Open source · Self-hostable
OWASP38
CybersecurityRaleigh, USA
A global non-profit foundation dedicated to improving software security through open community collaboration.
Open source · Self-hostable
vxtwitter.com31
Web DevelopmentSan Francisco, United States
The world's leading platform for software development and version control, enabling collaboration and code hosting for millions of developers.
Open source · Self-hostable
ChartDB26
Software DevelopmentTel Aviv, Israel
Visualize, edit, and collaborate on database schemas instantly with a powerful DB diagram editor.
Open source · Self-hostable
Node.js26
Software Development
An open-source, cross-platform JavaScript runtime environment.
Open source · Self-hostable
Cloud Native Computing Foundation15
Cloud ComputingIrvine, United States
The Cloud Native Computing Foundation (CNCF) is an open-source software foundation that aims to make cloud-native computing universal and sustainable.
Open source · Self-hostable
I3
i313
Software Development
A highly configurable and efficient tiling window manager for X11.
Open source · Self-hostable
Eclipse Foundation10
Open SourceBrussels, Belgium
A non-profit organization stewarding open source software projects, communities, and collaborative industry ecosystems.
Open source · Self-hostable
.NET8
Software DevelopmentRedmond, USA
A free, cross-platform, open-source developer platform for building many types of applications.
Open source · Self-hostable
Open Game Icons7
Game Development
A vast collection of free SVG and PNG icons for games and applications.
Open source
GDevelop7
Computer GamesLondon, GB
No-code game development platform empowering creators to build games without prior technical skills.
Open source
RU
Rubish
Software Development
A UNIX shell written entirely in Ruby, offering deep integration with Ruby code.
Open source
Sales & Dungeons
Gaming
Turn every thermal printer into a TTRPG companion machine!
Open source · Self-hostable

Company	Sector	License	HQ	Funding	Score
UbuntuA popular open-source Linux distribution.	Operating Systems	Open source · Self-hostable	London, United Kingdom	$63.0M	70
CodefreshOctopus Deploy provides a unified platform for continuous delivery, automating deployments, runbooks, and operations for modern applications.	Enterprise	Open source · Self-hostable	Brisbane, Australia	$42.0M	62
AppwriteOpen-source backend-as-a-service platform for building scalable applications.	Enterprise	Open source · Self-hostable	San Francisco, United States	$37.0M	58
MetalBearOpen-core company building tools for modern backend engineers to ship faster and better.	Software Development	Open source · Self-hostable	San Francisco, United States	$12.5M	56
OdigosOpen-source project for instant distributed tracing and metrics using eBPF and OpenTelemetry.	Enterprise	Open source · Self-hostable	—	$13.0M	56
KiloClawA managed, private, and production-grade environment for OpenClaw, offering access to over 500 AI models and essential tools.	Artificial Intelligence	Open source · Self-hostable	—	—	54
Comfy OrgComfy is an AI creation engine for visual professionals, offering granular control over AI models, parameters, and outputs through a node-based workflow on an infinite canvas.	AI Image Generation	Open source	—	$30.0M	53
TanStackDeveloper tools for building modern web applications.	Software Development	Open source · Self-hostable	San Francisco, Canada	$1.0M	50
All-Hands AIAn open-source platform for building and running AI coding agents that automate software development tasks.	Agentic AI	Open source · Self-hostable	Boston, United States	$5.0M	49
Heroic LabsSocial infrastructure for games, makers of Nakama game server.	Gaming	Open source · Self-hostable	Lisbon, Portugal	—	47
Open Source EndowmentA nonprofit endowment aiming to permanently solve the funding problem for open-source software maintainers.	Open Source	Open source · Self-hostable	San Francisco, United States	$750K	45
OWASPA global non-profit foundation dedicated to improving software security through open community collaboration.	Cybersecurity	Open source · Self-hostable	Raleigh, USA	—	38
vxtwitter.comThe world's leading platform for software development and version control, enabling collaboration and code hosting for millions of developers.	Web Development	Open source · Self-hostable	San Francisco, United States	—	31
ChartDBVisualize, edit, and collaborate on database schemas instantly with a powerful DB diagram editor.	Software Development	Open source · Self-hostable	Tel Aviv, Israel	—	26
Node.jsAn open-source, cross-platform JavaScript runtime environment.	Software Development	Open source · Self-hostable	—	—	26
Cloud Native Computing FoundationThe Cloud Native Computing Foundation (CNCF) is an open-source software foundation that aims to make cloud-native computing universal and sustainable.	Cloud Computing	Open source · Self-hostable	Irvine, United States	—	15
I3i3A highly configurable and efficient tiling window manager for X11.	Software Development	Open source · Self-hostable	—	—	13
Eclipse FoundationA non-profit organization stewarding open source software projects, communities, and collaborative industry ecosystems.	Open Source	Open source · Self-hostable	Brussels, Belgium	—	10
.NETA free, cross-platform, open-source developer platform for building many types of applications.	Software Development	Open source · Self-hostable	Redmond, USA	—	8
Open Game IconsA vast collection of free SVG and PNG icons for games and applications.	Game Development	Open source	—	—	7
GDevelopNo-code game development platform empowering creators to build games without prior technical skills.	Computer Games	Open source	London, GB	—	7
RURubishA UNIX shell written entirely in Ruby, offering deep integration with Ruby code.	Software Development	Open source	—	—	—
Sales & DungeonsTurn every thermal printer into a TTRPG companion machine!	Gaming	Open source · Self-hostable	—	—	—