You may find the available apps on the Atlassian Marketplace: Explore apps for Atlassian products | Atlassian Marketplace.
Make sure that you filter the hosting (deployment) type of your Atlassian products: Cloud, Data Center or Server.
Is it something else that you are asking?
There is another Atlassian product that has add-ons, which are not on the marketplace because the application is very very different to all the other Atlassian stuff, and the marketplace is not (yet) the right place to provide them.
For Trello add-ons (called "Power ups", see https://trello.com/power-ups
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I totally agree with @Nic Brough -Adaptavist- you have Trello power-ups too.
If you want to know what integrations Atlassian has developed for other software, you can take a look at Atlassian Product Integrations.
We can provide more help if you provided your use case :)
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