What issue tracking software does your team use? Are you satisfied?

Hello!

I am out and about around the internets trying to learn more about what the issue trackers and project management tools startups, open source projects and software service companies are using. For context, I am looking to seek validation around a potential niche I can see within the current issue tracking landscape.

With that in mind, I had a couple of questions that would be great to get some answers on:

1. How would you describe your business and what's your role? (Eg. Startup, software service company, open-source project).
2. What tool do you current use for issue/bug tracking?
3. How satisfied are you with the tool? (Any feedback on why you gave that answer would be great)
4. If applicable to your role, do you believe the tool is worth the cost?

Thanks for those that get back to me – I am very keen to hear from software teams (devs, designs, product managers, etc) and business owners/operation teams.