Top Alternatives to Phabricator

GitHub is a web-based Git or version control service.

Trello is a web based project management solution.

Redmine is a flexible project management web application.

Bitbucket is a web-based hosting service for source code and development projects.

GitLab is a web-based Git repository manager with wiki and issue tracking features.

SourceForge is a Web-based service that offers software developers a centralized online location to control and manage free and open-source software projects

Team Clerk is project and task management software.

Taiga is a project management platform for agile developers & designers.

Jira is a proprietary issue tracking product, developed by Atlassian.

Pivotal Tracker is a software as a service product for agile project management and collaboration.

Wekan is an open-source kanban board which allows a card-based task and to-do management, similar to tools like WorkFlowy or Trello.

Mantis Bug Tracker is a free and open source, web-based bug tracking system. The most common use of MantisBT is to track software defects.

Ubirimi is a project tracker for planning, building and launching products.

Ora is a real-time all-in-one workspace for teams.

Microsoft Project is a project management software product, developed and sold by Microsoft. It is designed to assist a project manager in developing a plan, assigning resources to tasks, tracking progress, managing the budget, and analyzing workloads.

Bugzilla is a web-based general-purpose bugtracker and testing tool.

OpenProject is a web-based project management system for location-independent team collaboration.

YouTrack is a commercial browser-based bug tracker, issue tracking system and project management software.

Flyspray is a lightweight, web-based bug tracking system written in PHP for assisting with software development and project managements.

Active Collab is a web-based project management tool.

Tuleap Open ALM is a libre & open source platform for agile management and software development.

FogBugz is an integrated web-based project management system featuring bug/issue tracking, discussion forums, wikis, customer relationship management, and evidence based scheduling.

SprintGround is a free task management for small software development teams and freelancers.