Google Summer of Code (GSoC)
253 organisations took part between 2024 and 2026. 200 have repositories measured so far, last updated 11 Oct 2026.
The ranking rule. Share of pull requests from outside the core team that got a reply from a person within 7 days, across all of the organisation's measured repositories. Ties go to the higher outside merge rate. An organisation needs at least 20 outside pull requests to take a place; smaller ones follow, unranked.
Each year Google funds new contributors to spend about 12 weeks building something for an open source project.
You work with a mentor from the organisation you applied to. You do not need to be a student, only new to open source and 18 or older.
You write a proposal to one of the organisations below. That is why it matters which of them reply to newcomers.
Details and dates are on the official Google Summer of Code site.
Now is the best time to start: contribute small fixes to the organisation you want, so the mentors know your name before applications open.
Oct
You are here.
Organisations
213 organisations measured on GitHub
Next-gen AI powered Open Source API DevTool
GSoC 2024, 2025, 2026 · 1 repository measured
pythonreactfluttertypescriptai
40 organisations cannot be measured on GitHub. They host their code elsewhere, or they are umbrella organisations whose projects change every year. They are listed so the ranking does not pretend they do not exist.
Mid January
Many publish their idea lists now.
Late February
Pick two or three and read their ideas.
Applications
Mid March
Send mentors a draft early for feedback.
End of March
About two weeks after opening.
End of April
Meet your mentor before coding starts.
Coding
Late May
About 12 paid weeks, midterm in July.
Late August
Larger projects can run into November.
Google has not published the 2027 dates yet; these follow the 2026 programme, which has kept the same shape for years. Official timeline
Scan code for origin, license and vulnerabilities
GSoC 2024, 2025, 2026 · 12 repositories measured
pythonjavascriptdjango+postgresqlc/rust/go
Start with aboutcode-org/scancode-toolkit
Democratize AI for drug discovery.
GSoC 2024, 2025, 2026 · 1 repository measured
pythonnumpypytorchhuggingface
Open access genomics and bioinformatics projects
GSoC 2026 · 12 repositories measured
pythonreactr-projectgraphangular
Open source robotics and a whole lot more!
GSoC 2024, 2025, 2026 · 5 repositories measured
pythonrosgazeboc++bevy
Social media and member management for non-profits
GSoC 2024, 2025 · 6 repositories measured
pythonpostgresqlfluttergraphqltypescript
Simulating electromagnetic wave propagation
GSoC 2024, 2025, 2026 · 1 repository measured
pythoncudaopenmpmpiopencl
Start with gprMax/gprMax
Lightweight cross-platform desktop app framework
GSoC 2024, 2026 · 6 repositories measured
cjavascriptnode.jsc++typescript
Start with neutralinojs/neutralinojs
The coupling library for multi-physics simulations
GSoC 2026 · 12 repositories measured
cpythonshellc++
Start with precice/precice
Start with mapeditor/tiled
Dates for the next round are published by Google on the official timeline. Contributable is independent and not affiliated with Google.