Open Source startup ecosystem
We track 37 organisations in this sector across 6+ countries.
Showing 1–20 of 37 Open Source
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Aiven
Aiven is a Helsinki-based cloud data platform founded in 2016 that provides fully managed open-source data infrastructure services including PostgreSQL, Apache Kafka, Redis, Elasticsearch, and ClickHouse across all major cloud providers. The company raised over $270 million including a $210 million Series D in 2022 at a $3 billion valuation, making it Finland's most valuable startup at the time. Aiven serves thousands of customers globally and employs over 500 people. By abstracting the operational complexity of open-source data tools, Aiven enables engineering teams to focus on building rather than managing infrastructure.
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Catch the Tornado
Catch the Tornado is a Wrocław-based venture builder and investment firm founded by Divante alumni Piotr Karwatka and Tomasz Karwatka after Divante's exit. The firm builds and backs open-source, composable-commerce, and AI-first companies with hands-on operator support. Portfolio and venture-build references include Alokai (formerly Vue Storefront), Ramp Network, and Rigby.
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Chris Aniszczyk
Chief Technology Officer of the Cloud Native Computing Foundation (CNCF), the open-source foundation behind Kubernetes and the broader cloud-native ecosystem. He is an announced speaker at Kubernetes Community Days (KCD) Sofia 2026, addressing the regional cloud-native developer community.
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Cloud Native Days France 2026
Community-led cloud conference at CENTQUATRE-PARIS focused on practical engineering sessions over vendor marketing. Strong match for infrastructure startups and DevOps-first teams working on Kubernetes, platform tooling, and secure cloud operations.
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Cloud Native Days France 2027
Cloud Native Days France 2027 takes place 3 June at CENTQUATRE-Paris, organised by the Cloud Native France association. The one-day conference gathers the French-speaking cloud native and DevOps community, open to juniors through senior architects and decision-makers, for talks on infrastructure, DevOps, cloud native and open source practices.
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Defguard
Defguard is a Warsaw-based open-source cybersecurity company building the only enterprise VPN platform that embeds multi-factor authentication natively at the WireGuard protocol level, closing the gap between network access and identity that standard WireGuard deployments leave open. The fully self-hosted platform unifies VPN connectivity, identity and access management, SSO (Google Workspace, Microsoft Entra ID, Okta, LDAP, Active Directory), firewall policy orchestration and SIEM integration in a single Rust-built stack that customers run entirely on their own infrastructure — with no third-party cloud dependency and no US CLOUD Act exposure, supporting GDPR, NIS2, HIPAA and ISO 27001 compliance. Defguard spun out of teonite, a Polish software venture builder co-founded by CEO Robert Olejnik, and was publicly released on GitHub in May 2023 under an AGPL licence; its open-source core has gathered around 2,700 GitHub stars, with enterprise features under a commercial licence. In May 2025 it raised €1.2M (PLN 5.2M) in a pre-seed round led by Polish VC Hard2beat, with SMOK Ventures, S20 Team and cybersecurity firm ISEC, plus angels including Łukasz Jesis (Xopero). Version 2.0, released in April 2026, re-architected the platform with high availability and built-in SSL termination.
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DevConf.CZ 2026
Free, annual community conference organized by Red Hat Czech Republic, focusing on open source, Linux, cloud, and containerization. Attracts 1,800+ developers to Brno's Faculty of Information Technology. An essential event for open-source startups and developer hiring in the CEE region.
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Devoxx France 2026
Developer-first conference centered on software architecture, cloud systems, and modern engineering practices. Strong channel for DevTools and infrastructure startups building technical communities with senior engineers and CTOs.
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Devoxx France 2027
Devoxx France's 15th edition is confirmed for 7-9 April 2027 at the Palais des Congres, Paris, with a countdown already live on the site. The developer-first conference covers software architecture, cloud systems, and modern engineering practices for senior engineers and CTOs.
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EU Open Source Policy Summit 2026
Conference on open source policy, bringing together policymakers, industry leaders, and open source community members to discuss current trends and future directions in Brussels.
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FOSDEM 2026
Free and open source software developers' conference, covering a wide range of topics and technologies. A major community-driven event for open source enthusiasts and professionals in Brussels.
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Freek Van der Herten
Developer and partner at Belgian web agency Spatie, prolific open-source author of widely used Laravel packages and host of the Laravel and PHP community. He is a confirmed speaker at Laravel Live Denmark 2026 in Copenhagen, sharing practical Laravel and package-development insights.
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Hans Roth
Hans Roth is Senior Vice President and General Manager for EMEA at Red Hat, the world's leading provider of enterprise open source software solutions and an IBM subsidiary. In this role he oversees Red Hat's business across Europe, the Middle East, and Africa, driving enterprise adoption of open source technologies including Red Hat Enterprise Linux, OpenShift Kubernetes platform, and Ansible automation. He is a senior technology industry executive with significant influence in the European enterprise software and cloud infrastructure market.
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Julien Richard
Co-founder and CTO of Filigran, leading engineering for its open-source threat-intelligence and breach-and-attack-simulation platforms.
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KCD Sofia (September 2026)
Kubernetes Community Days (KCD) Sofia is a CNCF-affiliated, single-day, single-track cloud-native conference at the Sofia Event Center, capped at around 600 attendees. The programme features practitioner talks from teams running Kubernetes in production, covering platform engineering, observability, security, GitOps, FinOps and machine learning.
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Mistral AI
Founded in April 2023 by former Google DeepMind and Meta AI researchers, Mistral AI has become one of Europe's most valuable AI startups. The company builds frontier large language models such as Mistral Large and Mixtral and follows an open-weight plus enterprise deployment strategy. Its products are used via API, cloud partners such as Microsoft Azure, and local deployments for regulated organizations requiring data control and model transparency. Le Chat is the company's conversational interface built on its model stack.
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NumFOCUS
NumFOCUS is a US-based 501(c)(3) nonprofit that promotes open source scientific computing through fiscal sponsorship of more than 60 projects, including NumPy, Pandas, and Jupyter. It operates the PyData educational program globally, which organizes conferences and community events for data scientists and developers around the world. NumFOCUS serves as a Super Organizer and institutional backbone for PyData PyCon Yerevan 2026.
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Ondřej Mirtes
Czech software engineer and creator of PHPStan, the popular static analysis tool for PHP that helps developers find bugs before runtime. He is a confirmed speaker at Laravel Live Denmark 2026 in Copenhagen, where he discusses static analysis and code quality in modern PHP.
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Open Mercato
Open-source, AI-native commerce and operations framework co-founded in 2025 by Piotr Karwatka (creator of Vue Storefront / Alokai) and Tomasz Karwatka (founder of Divante). It provides modular infrastructure for building custom commerce, ERP and finance software with AI-assisted engineering, combining SaaS speed with bespoke flexibility.
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Open Source Conference Luxembourg
Organiser of the Open Source Conference Luxembourg, a gathering of international Open Source Program Offices and related organisations. The conference exchanges experience on implementing and securing open-source software across the public sector, AI and large language models, cybersecurity, academia and humanitarian use.
