Curated list of open source and low-cost bug and issue tracking software (2020)

Photo credit: John Schnobrich (Unsplash license)
Introduction about bug and issue tracking software
I had to admit I liked Atlassian Jira as a bug and issue tracking software. However, Atlassian had announced that when it's in 2021 February, the standalone server version would be gone. Also, there would be a price increase of all the existing data center version.
So let's look at other alternatives. In this article, I would briefly describe several open source and low cost bug and issue tracking …