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Slipshow: A Full-Featured Presentation Tool in OCaml Paul-Elliot Anglès d'Auriac ABSTRACT Slipshow is a tool to create interactive presentations. Started as a JavaScript project, it is now fully written in OCaml and features a runtime engine, a compiler, a collaborative editing website, a VSCode extension, a standalone app... This talk tells the story of how it is possible to develop and maintain such a challenging project as a single developer. Session page: https://fun-ocaml.com/2025/slipshow/ Connect with FUN OCaml: Twitter: https://x.com/FunOCaml Bluesky: https://bsky.app/profile/fun-ocaml.com #ocaml --- Big Thanks(TM) go to our generous sponsors who made FUN OCaml possible! * Octra Labs - https://octra.org/ - Platinum Sponsor * Ahrefs - https://ahrefs.com/ - Platinum Sponsor * Dialo - https://dialo.ai/ - Gold Sponsor * LexiFi - https://www.lexifi.com - Bronze Sponsor * Jane Street - https://www.janestreet.com/ - Bronze Sponsor * LightSource - Volunteer / Organizer Commitment * Tarides - Volunteer / Organizer Commitment

Reflections on UK-India AI collaboration from meetings at the Alan Turing Institute and OpenUK, discussing ethical AI deployment, open source infrastructure, and the challenges of building community in the age of AI-assisted coding.

0xCaml From a System Engineer's Point of View Dmitriy Kovalenko (LightSource) ABSTRACT I do a lot of Rust, C, Zig and whatever else cursed systems programming languages are there. So recently 0xCaml popped out and I was def interested if I can finally use it. So I did some research on how it actually works comparing to native OCaml and other languages and try to build odiff (the fastest image comparison lib in the world) with 0xCaml. Here is what I learned. Session page: https://fun-ocaml.com/2025/oxcaml-system-engineers-pov/ Connect with FUN OCaml: Twitter: https://x.com/FunOCaml Bluesky: https://bsky.app/profile/fun-ocaml.com #ocaml --- Big Thanks(TM) go to our generous sponsors who made FUN OCaml possible! * Octra Labs - https://octra.org/ - Platinum Sponsor * Ahrefs - https://ahrefs.com/ - Platinum Sponsor * Dialo - https://dialo.ai/ - Gold Sponsor * LexiFi - https://www.lexifi.com - Bronze Sponsor * Jane Street - https://www.janestreet.com/ - Bronze Sponsor * LightSource - Volunteer / Organizer Commitment * Tarides - Volunteer / Organizer Commitment

Performance Pitfalls: Tales From a Python/OCaml Codebase Emma Jin (Semgrep) ABSTRACT Semgrep is a tool that enables developers to search their code for security vulnerabilities, built with an OCaml engine and a Python frontend. This has come with a fair amount of performance pain. In this talk, I'll share some of the worst problems we ran into, how we found them, and how we solved them (mostly, rewriting Python code in OCaml). Session page: https://fun-ocaml.com/2025/performance-pitfalls-tales-from-a-python-ocaml-codebase/ Connect with FUN OCaml: Twitter: https://x.com/FunOCaml Bluesky: https://bsky.app/profile/fun-ocaml.com #ocaml --- Big Thanks(TM) go to our generous sponsors who made FUN OCaml possible! * Octra Labs - https://octra.org/ - Platinum Sponsor * Ahrefs - https://ahrefs.com/ - Platinum Sponsor * Dialo - https://dialo.ai/ - Gold Sponsor * LexiFi - https://www.lexifi.com - Bronze Sponsor * Jane Street - https://www.janestreet.com/ - Bronze Sponsor * LightSource - Volunteer / Organizer Commitment * Tarides - Volunteer / Organizer Commitment

Generating Static Websites the Functional Programming Way Xavier Van de Woestyne (Tarides) ABSTRACT Static site generators like Jekyll, Zola, and Hugo are effective, but fall short for complex sites like personal encyclopedias, wikis, or sites with rich content. Features like backlinks and transclusions require richer context and efficient builds. This talk explores the theory behind static site generation (as a case of build systems) and shows how to implement advanced features inspired by Project Xanadu using YOCaml, a static site framework based on functional abstractions (such as strong profunctors) in OCaml. Session page: https://fun-ocaml.com/2025/static-websites-functional-programming/ Connect with FUN OCaml: Twitter: https://x.com/FunOCaml Bluesky: https://bsky.app/profile/fun-ocaml.com #ocaml --- Big Thanks(TM) go to our generous sponsors who made FUN OCaml possible! * Octra Labs - https://octra.org/ - Platinum Sponsor * Ahrefs - https://ahrefs.com/ - Platinum Sponsor * Dialo - https://dialo.ai/ - Gold Sponsor * LexiFi - https://www.lexifi.com - Bronze Sponsor * Jane Street - https://www.janestreet.com/ - Bronze Sponsor * LightSource - Volunteer / Organizer Commitment * Tarides - Volunteer / Organizer Commitment

From OCaml 4 to 5 and from Parmap to Effects: A legacy code transition story SPEAKERS Nathan Taylor (Semgrep) Nat Mote (Semgrep) ABSTRACT OCaml 5's support for shared memory parallelism and effects-based concurrency opens up new ways for developers to build new OCaml programs for modern hardware, but it isn't trivial to migrate existing software to this new world. We've spent the last few months porting a large (~3MM LoC) OCaml codebase from process-based parallelism to multi-domain Eio, and learned a lot along the way. In this talk, we'll discuss the fundamentals of shared-memory parallism, our incremental migration approach which used a combination of static and dynamic analysis, the pitfalls (both expected and unexpected) that we encountered along the way, and some lessons that others can adopt for their own journey. Session page: https://fun-ocaml.com/2025/from-ocaml-4-to-5/ Connect with FUN OCaml: Twitter: https://x.com/FunOCaml Bluesky: https://bsky.app/profile/fun-ocaml.com #ocaml --- Big Thanks(TM) go to our generous sponsors who made FUN OCaml possible! * Octra Labs - https://octra.org/ - Platinum Sponsor * Ahrefs - https://ahrefs.com/ - Platinum Sponsor * Dialo - https://dialo.ai/ - Gold Sponsor * LexiFi - https://www.lexifi.com - Bronze Sponsor * Jane Street - https://www.janestreet.com/ - Bronze Sponsor * LightSource - Volunteer / Organizer Commitment * Tarides - Volunteer / Organizer Commitment