Open source focus

Open Source Alternatives to Feelday

20 open source Appointment Scheduling options similar to Feelday, 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.

View all alternatives to Feelday →

Gitpod63
Developer ToolsTübingen, Germany$28.0M
Cloud Development Environments for efficient and secure team software development.
Open source · Self-hostable
Probo58
SMB SoftwareTel Aviv, Israel$2.5M
Open-source compliance solution for startups to achieve SOC 2, ISO 27001, and HIPAA.
Open source · Self-hostable
Flectra27
Open SourceAhmedabad, India
Open-source ERP and CRM software to streamline business operations and enhance productivity.
Open source · Self-hostable
Omnivore23
Consumer App
A free and open-source read-it-later service with AI-powered features and integrations.
Open source · Self-hostable
Zotero22
Research ToolsFairfax, United States
Free, open-source personal research assistant for collecting, organizing, citing, and sharing research.
Open source · Self-hostable
ERPNext20
Enterprise SoftwareBangalore, India
Open-source ERP system for small and medium-sized businesses.
Open source · Self-hostable
Realnas19
Open Source
Open-source Network Attached Storage (NAS) operating system based on FreeBSD, managing ZFS, SMB, NFS, users, snapshots, and boot environments.
Open source · Self-hostable
Cap19
Developer ToolsSan Francisco, United States
Open-source screen recording, editing, and hosting tool with ownership of your data.
Open source · Self-hostable
Dolibarr18
Open Source
Open-source ERP and CRM web suite for businesses of all sizes.
Open source · Self-hostable
I3
i313
Software Development
A highly configurable and efficient tiling window manager for X11.
Open source · Self-hostable
EU
Euro-Office10
SoftwareEurope
A sovereign, open-source office suite for European enterprises and public administrations.
Open source · Self-hostable
LibreChat10
AINew York, United States
Open-source, self-hostable AI chatbot UI.
Open source · Self-hostable
EU
Eurostack10
SoftwareEurope
A European enterprise contributing to the development of sovereign digital infrastructure.
Open source · Self-hostable
Snipit Good8
Developer Tools
Free and open-source Windows capture tool for instant snips, MP4 recordings, and private share links.
Open source
Naps2 Software8
Document Management
Free and open-source scanning software for Windows, Mac, and Linux, simplifying document digitization.
Open source · Self-hostable
FINLAI designs8
Digitalization PartnershipsLinz, Austria
Develops digitalization partnerships, local IT security software (NoRisk), and AI agents for sole proprietors and SMEs.
Open source
OP
OpenWorker7
Agentic AI
OpenWorker is an open-source desktop AI agent that runs locally, integrates with everyday tools, and delivers finished outcomes by breaking down tasks.
Open source
Fractask7
Open Source
Open-source task tree for humans and AI, built around the Fractask method.
Open source · Self-hostable
Orcaforge7
3D Printing
An open-source fork of OrcaSlicer with a built-in plugin marketplace for 3D printing.
Open source · Self-hostable
Thunderbird
Email Client
Free and open-source email client for managing email, calendars, and contacts.
Open source · Self-hostable

Company	Sector	License	HQ	Funding	Score
GitpodCloud Development Environments for efficient and secure team software development.	Developer Tools	Open source · Self-hostable	Tübingen, Germany	$28.0M	63
ProboOpen-source compliance solution for startups to achieve SOC 2, ISO 27001, and HIPAA.	SMB Software	Open source · Self-hostable	Tel Aviv, Israel	$2.5M	58
FlectraOpen-source ERP and CRM software to streamline business operations and enhance productivity.	Open Source	Open source · Self-hostable	Ahmedabad, India	—	27
OmnivoreA free and open-source read-it-later service with AI-powered features and integrations.	Consumer App	Open source · Self-hostable	—	—	23
ZoteroFree, open-source personal research assistant for collecting, organizing, citing, and sharing research.	Research Tools	Open source · Self-hostable	Fairfax, United States	—	22
ERPNextOpen-source ERP system for small and medium-sized businesses.	Enterprise Software	Open source · Self-hostable	Bangalore, India	—	20
RealnasOpen-source Network Attached Storage (NAS) operating system based on FreeBSD, managing ZFS, SMB, NFS, users, snapshots, and boot environments.	Open Source	Open source · Self-hostable	—	—	19
CapOpen-source screen recording, editing, and hosting tool with ownership of your data.	Developer Tools	Open source · Self-hostable	San Francisco, United States	—	19
DolibarrOpen-source ERP and CRM web suite for businesses of all sizes.	Open Source	Open source · Self-hostable	—	—	18
I3i3A highly configurable and efficient tiling window manager for X11.	Software Development	Open source · Self-hostable	—	—	13
EUEuro-OfficeA sovereign, open-source office suite for European enterprises and public administrations.	Software	Open source · Self-hostable	Europe	—	10
LibreChatOpen-source, self-hostable AI chatbot UI.	AI	Open source · Self-hostable	New York, United States	—	10
EUEurostackA European enterprise contributing to the development of sovereign digital infrastructure.	Software	Open source · Self-hostable	Europe	—	10
Snipit GoodFree and open-source Windows capture tool for instant snips, MP4 recordings, and private share links.	Developer Tools	Open source	—	—	8
Naps2 SoftwareFree and open-source scanning software for Windows, Mac, and Linux, simplifying document digitization.	Document Management	Open source · Self-hostable	—	—	8
FINLAI designsDevelops digitalization partnerships, local IT security software (NoRisk), and AI agents for sole proprietors and SMEs.	Digitalization Partnerships	Open source	Linz, Austria	—	8
OPOpenWorkerOpenWorker is an open-source desktop AI agent that runs locally, integrates with everyday tools, and delivers finished outcomes by breaking down tasks.	Agentic AI	Open source	—	—	7
FractaskOpen-source task tree for humans and AI, built around the Fractask method.	Open Source	Open source · Self-hostable	—	—	7
OrcaforgeAn open-source fork of OrcaSlicer with a built-in plugin marketplace for 3D printing.	3D Printing	Open source · Self-hostable	—	—	7
ThunderbirdFree and open-source email client for managing email, calendars, and contacts.	Email Client	Open source · Self-hostable	—	—	—