Diveni is a web based app to do distributed Planning Poker. It could be connected to Atlassian JIRA or Microsoft DevOps to select User Stories and update the estimation automatically.
Do your Planning Poker in your distributed teams in an easy way!
It is a great tool to manage projects. It is completly free and it is constantly improved and maintained. Features are developed quite frequently and there are also connectors to project management softwares like Jira Server, Jira Cloud, Github and also GitLab.