The best alternatives to VarCI are Branches, Cashew, and Overv.io (beta). If these 3 options don't work for you, we've listed a few more alternatives below.
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Issue TODO is a chrome extension that quickly copies a github or Jira issue to your clipboard so you can paste it into your code as a TODO. It also includes a link to the issue and author for easy reference and will put you right in the comment field when you visit a github issue, so you can immediately join the conversation.
A GitHub App/Action that automates the creation of issue branches (either automatically after assigning an issue or after commenting on an issue with a ChatOps command: /create-issue-branch or /cib).