I studied about developer services offered by main manufactures, and InterSystems is the leader, see:
| Better Developer support/services | |||||
| Feature | InterSystems | Microsoft | Oracle | IBM | Redhat |
| Development Community Web Portal | 1 | 1 | 1 | 1 | 1 |
| Discord or twitch developer channel | 1 | 1 | 0 | 0 | 0 |
| Linkedin, Twitter, Facebook developer channel | 1 | 1 | 1 | 1 | 1 |
| YouTube and Podcast Channel | 1 | 1 | 1 | 1 | 1 |
| Certification program | 1 | 1 | 1 | 1 | 1 |
| Developer Open IDE Tools | 1 | 1 | 1 | 0 | 1 |
| Newsletter | 1 | 1 | 1 | 1 | 1 |
| Free e-learning courses | 1 | 0 | 0 | 0 | 0 |
| Online product documentation | 1 | 1 | 1 | 1 | 1 |
| Free product community edition | 1 | 1 | 1 | 0 | 1 |
| Free product instance in the public cloud | 1 | 1 | 1 | 1 | 0 |
| Free Hands-on e-books | 0 | 0 | 0 | 1 | 1 |
| Developer Community Open source solutions portal | 1 | 1 | 0 | 0 | 0 |
| Gamified developer community portal | 1 | 0 | 0 | 0 | 0 |
| Frequent hackthon competitions | 1 | 0 | 0 | 1 | 0 |
| Redeem prizes from developer participation efforts | 1 | 0 | 0 | 0 | 0 |
| Global Developer event | 1 | 1 | 1 | 1 | 1 |
| Public recognition by developer level | 1 | 0 | 1 | 0 | 0 |
| Meetup groups | 1 | 1 | 1 | 1 | 1 |
| Open source initiatives | 1 | 1 | 1 | 1 | 1 |
| Total: | 19 | 14 | 13 | 12 | 12 |
Other vendors from your list have some kind of developer certification as well. E.g., https://docs.microsoft.com/en-us/learn/certifications/
Or you meant something else, didn't you?
This item is Certification program.
Public recognition by developer level is about ACE program from Oracle, or in the InterSystems with advocate, specialist, expert, ambassador and vip level, for example.