Hey @Dmitry Konnov! As long as your submission isn't violating the license(s) of the software it depends on, there's no restriction on using commercial software. Keep in mind that contest submissions are Open Source, which might impact your choice of commercial software!
Loved getting to see all the awesome demos y'all created!
Thanks Kate!
@Alex Bravo to add a bit of context: Metabase makes a distinct between "Officially supported drivers" and "Community drivers." Officially supported drivers are owned and maintained by the Metabase team, while Community drivers are owned and maintained by the community. Additionally, Community drivers are not supported in Metabase Cloud.
In our case, the InterSystems IRIS Metabase driver was created by @Siddardha Reddy Sanagala and is now listed in the Metabase documentation. The article that Kate mentioned has a ton of great information, and you can find the driver directly on Github and our OpenExchange.