Doc Sheets is described as 'Develop apps | Software | Systems | Devices' and is a project management tool in the business & commerce category. There are three alternatives to Doc Sheets, not only websites but also apps for Linux, Windows, SaaS and Self-Hosted. The best Doc Sheets alternative is Tuleap, which is free. Other great sites and apps similar to Doc Sheets are Cradle and Polarion.
Tuleap is the first fully libre and open source software (GPL licence) for Enterprise Application Lifecycle Management. Tuleap is provided by the Enalean company and the community members.
Cradle by 3SL is a requirements management and software / systems engineering tool for agile and phase-based projects including MBSE, agile development, document & project management. Cradle supports small or large teams, either co-located or distributed.
One unified environment across the entire application development lifecycle: Requirements, design, coding, testing, and release.
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