Canopy Tax financially supports the third party open source project SystemJS. Read about the announcement here: https://canopytax.github.io/post/systemjs-sponsorship/

Also you will see our sponsorship listed in the project's readme.md at https://github.com/systemjs/systemjs

Thinkmill are an agency in Sydney. We have a number of opensource projects and have funded other projects in the past. 
http:https://keystonejs.com/
https://github.com/styled-components/styled-components

Thinkmill encourages employees to work on open source projects in working hours.

sitegeist is a German web agency based in Hamburg. Besides allowing and encouraging their employees to contribute to and/or publish their own open source projects, the company also supports the communities and development teams behind those open source products they are using on a regular basis. For the larger part these are:

* TYPO3 (https://typo3.org/)
* Neos CMS (https://www.neos.io/)

Their support for these projects includes:

* Financial support
* Organization and sponsoring of conferences, meetups and other event formats
* Contribution in community building and software development

Adding admin on rest for marmelab and api-platform for Les-Tilleuls.coop

see also https://github.com/renuo