Here's a business plan: copy the features of RequestTracker in a different language; integrate a wiki with custom markdown-like syntax to dynamically pull data

Here's a business plan: copy the features of RequestTracker in a different language; integrate a wiki with custom markdown-like syntax to dynamically pull data from the tickets; have a workflow to publish things from the internal side to a public side that makes it easy to audit for dynamic data flows. Design for self-federation, so that teams can have their own servers pub/sub queues, search across servers, and enact security boundaries. You now have a product that will work for about 90% of existing JIRA users. Sell it in three versions: open-source no support, self-hosted with support-per-user, and hosted SaaS with support per team.