Azure DevOps Market Place is where you can find all the extensions of Azure DevOps which has been created by third party developers as well as official developers like Microsoft and MS-DevOps.It hosts nearly more than 1000 Azure DevOps extensions. It can be accessed directly following this link – https://marketplace.visualstudio.com/azuredevops
You can also access it directly by clicking on the “MarketPlace” icon at the top right toolbar and then clicking on “Browser marketplace” as shown below.
In marketplace, we can browse through extensions by different categories such as Azure Boards, Azure Repos, Azure Pipelines,Azure TestPlans and Azure Artifacts or search through the extensions by typing them directly as shown below.
Some of the offical developers are listed below
Microsoft – https://marketplace.visualstudio.com/publishers/Microsoft
Microsoft DevLabs – https://marketplace.visualstudio.com/publishers/Microsoft%20DevLabs
In addition to that you can also create your own extension and publish it privately so that it can be shared within your organization. You can also install multiple widgets from this marketplace.