European Summer of Code (ESoC)

What it is: A worldwide program (not limited to EU citizens) that matches open-source newcomers with mentoring organizations. Multiple cohorts per year with spring application batches.

Who can apply: Open worldwide; especially aimed at people new to open source.

Duration: ~3 months per project.

Stipend: Paid stipends available; amount varies by project (see official site each round).

Typical timeline:

• Info event + applicant guide — often late January
• Batch 1 applications — often February–March (deadlines usually 18:00 UTC)
• Batch 2 applications — often April
• Projects start April/May depending on batch

Official: esoc.dev

Tip: Beginner-friendly alternative or complement to GSoC — read the applicant guide from the January info event before choosing orgs.