There are plenty of things you can do to help with the effort.

• Pick any open source project an contribute to it.
  • Answer questions raised by other users of the project.
  • Comment on open issues of the project.
  • Help with the documentation.
  • Help with the translation (if relevant).
  • Review open pull-requests.
  • Add tests.
  • Fix bugs.
  • Add features.
  • ...
• Pick an open source project maintained by an Israeli person or company. (It might be easier and it might strengthen the local community more.)
  • Top GitHub committers in Israel.
  • TODO: How can we find all the open source projects developed by Israelies?
• Participate in the activities of one or more of the local communities (WhatsApp, Telegram, Facebook, Meetup).
• Help with the organization of events. (Monthly meetups, conferences, hackathons, etc.)
• Get your company to contribute to open source.
  • Encourage your co-workers to contribute back to the open source libraries you use at your workplace.

The OSDC, The Open Source Development [Conference | Community | Club | Course] provides materials to help teach employees or students to contribute to open source projects.