There are a lot of corporations that share some of the software they created for themselves under an Open Source license. It is very interesting to see and also an opportunity to increase your chances of employment. Make yourself familiar with their code, open some issues, send some pull-requests. If you are lucky they might notice you and offer you a job. Even if that does not happen you can include your contribution in your CV and you can mention it during the ineterview.
There are separate lists Open Source by Higher Education Institutes and Open Source by government
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https://github.com/bioinform Roche Sequencing Solutions
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https://github.com/vanstyn (Owner of https://www.intellitree.com/)
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https://github.com/nrdvana (Most senior employee of https://www.intellitree.com/)
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https://github.com/bucardo collected on https://www.endpointdev.com/ (by https://www.endpointdev.com/ )
This is going to be a separate list of companies where the main product is itself Open Source. For these the above suggestion might be even more relevant, but I felt they deserve a separate category.
- https://github.com/Chef
- https://github.com/Eelastic
- https://github.com/MongoDB
- https://github.com/MongoDB-developer
- https://github.com/MongoDB-labs
- https://github.com/MongoDB-js
- https://github.com/RedisLabs
- https://github.com/RedisLabsDemo
- https://github.com/WordPress see also Wordpress
- GitLab.org and GitLab.com