Sifter - Sifter is designed to be a simple bug and issue tracker for small teams and works especially great for teams with non-technical folks involved.
Jama Connect - The Leader in Requirements Management Solutions
JXL for Jira - The power of Jira with the familiarity of spreadsheets
ReqView - Simple and powerful requirements management tool enabling easy requirements gathering, traceability tracking and offline collaboration.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Enterprise Tester - Test Management and QA software, offering: full tracability, rich and indepth reporting, integrations with the likes of Atlassian Jira and an extensive API