“My first choice would be Penpot if your goal is to replace Figma while keeping design assets and collaboration under your control.”
“Best overall open-source option”
“Deployment: Docker, Kubernetes, OpenShift.”
“Security: Self-hosted, with options for private and air-gapped deployment.”
“Penpot | Strong | Yes | Yes”
“I'd choose Axure if your team creates complex workflows, conditional interactions, or detailed enterprise application prototypes.”
“Best for complex enterprise prototypes”
“Security: SSO, LDAP, Active Directory and infrastructure hosted behind your firewall.”
“Penpot and Axure have particularly clear official deployment documentation.”
“Important limitation: On-premises hosting supports RP prototypes, but not Axure Cloud's whiteboards and documents.”
“Prototyping combined with usability testing | Quant-UX”
“Particularly interesting if you want to conduct usability testing without sending participant data to an external SaaS provider.”
“Quant-UX | Self-managed | Yes | Yes”
“Quant-UX is an attractive open-source option, but I'd validate its maintenance, support and enterprise operational requirements independently.”
“Worth evaluating if you want an integrated design platform rather than assembling open-source components.”
“Security: Enterprise permissions, member management and activity logging.”
“Licensing: Commercial; deployment details require vendor confirmation.”
“Pencil Project | Local desktop, no cloud required | Wireframes and GUI mockups”
“It is better for individual offline work than collaborative design.”
“Pencil | Desktop/local | Limited | Yes”
“Excalidraw | Self-hosted web client | Sketches, low-fidelity wireframes and diagrams”
“Excalidraw | Self-hostable | Limited in OSS deployment | Yes”
“draw.io | Self-hosted | User flows, architecture diagrams and basic mockups”
“can be deployed using Docker, but the open-source self-hosted version currently lacks built-in sharing and collaboration.”
“For teams with strict data-security requirements, there are several viable alternatives to cloud-only tools like Figma.”