- Jira is pretty bog-standard these days, huge installed base. It's a bit weird to administer, and not as powerful in many ways as I'd like (especially compared to a more flexible system like ServiceNow). However, it's entrenched and a lot of people like it.
- Confluence is a top tier wiki. I actually find it very nice to work with, both from an editing, organizing, and also an API standpoint. It's much nicer than MediaWiki or Sharepoint for this purpose, and though it's not ideal for collaboration on MS documents, it's still very solid for working on shared documentation.
- Bamboo is a decent build system. It's lagging behind Jenkins in terms of integrations and support for source-controlled declarative build stuff, but for teams that like to point and click it works well, and the support for parallel builds, branch builds, etc. is all much easier than it is in Jenkins.
- Bitbucket is a reasonable choice for on-prem Git hosting. I prefer GHE, but if you have the rest of the Atlassian apps, there are some integrations that are nice, and it's not terribly expensive, so if you have ops familiar with running Atlassian apps it may be a good choice for you.
That's about it. Not something I love, but definitely not something I hate. Their support is also quite good, and guided me through a painful upgrade of a stack that my predecessors had left neglected for five years with no patching. Can't complain about that!