The tools from Tempo Software and Appfire are simply unbeatable.
I use similar apps across a couple of workspaces with a few connectors. But, if I had to choose top 3 Atlassian apps, only, it would be Plans in Jira, Automations in Jira, and eazyBI. Plans would be for the roadmapping/capacity; Automations for getting repetitious actions knocked out while team focuses on tasks requiring expertise and specialization; and eazyBI for analytics and audits.
Hi OKR board and automation for Jira help me a lots in planning and repetitive tasks in JIra
For me, BigPicture combined with Tempo provides better planning and capacity management.
The second choice is Plan (Advanced Roadmaps), which is less versatile than BigPicture but simpler to implement.
Time in Status - https://marketplace.atlassian.com/apps/1219732/time-in-status has been very useful to help our capacity planning!
We have not needed any marketplace apps for tracking our OKRs so far; the built in Jira Plans are so good on meeting our needs here!
I really like to use Jira Product Discovery and the integration with Jira and Confluence is great.