Redmine is described as 'Flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database' and is a very popular project management tool in the office & productivity category. There are more than 100 alternatives to Redmine for a variety of platforms, including Web-based, Windows, SaaS, Mac and iPhone apps. The best Redmine alternative is AFFiNE, which is both free and Open Source. Other great apps like Redmine are SourceForge, Kan.bn, Taiga.io and JIRA.
Adaptive suite integrating project, IT service, and source code management for technology teams, featuring time tracking, issue and document management, customizable dashboards, third-party integration, agile and waterfall support, and cloud deployment options.
Redbooth (formerly Teambox), the cloud-based company redefining collaboration and business communications. Easily organize teams and projects to ensure visibility and accountability, enabling your team to get more accomplished.
Mantis Bug Tracker is a free and open source, web-based bug tracking system. It is written in the PHP scripting language and works with MySQL, MS SQL, and PostgreSQL databases and a webserver. MantisBT can be installed on Windows, Linux, Mac OS, OS/2, and others.
Most users think Mantis Bug Tracker is a great Redmine alternative.
Open-source platform unifying project, document, issue, and task management with real-time team collaboration, instant messaging, video conferencing, and GitHub bidirectional sync, all in one customizable workspace for developers and product teams.
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.
Better UI, native integrated tools, support scrum and kanban
A project management tool that can be adapted to your processes to help you deliver great products. Track tasks and bugs, plan sprints and releases, create workflows, and customize YouTrack for your business processes. Never force your process to fit the limits of a tool again.
Comprehensive platform for managing client work operations with features like project management, communication facilitation, resource management, and time tracking. It ensures profit optimization, efficient task planning, and decision-making through data, while preventing burnout by balancing workloads.
Flowlu allows running your entire company in one single place — manage projects and tasks, track revenue and expenses, invoice your customers, capture leads and communicate with clients, share knowledge and effectively collaborate with your team.
ZenTao is an open source project management tool, supporting Scrum. It integrates product management, project management, bug management and QA management, etc., covering all lifecycle of software development.
Online workspaces with best of breed tools like Tasks & Issue Management, SVN & Git Repositories, Kanban Cardwall, Wikis, File Sharing, GDocs & Dropbox Integration, Milestones Management, Time Tracking, Support Tool for Clients, Backlog Manager, Custom Reporting
ONLYOFFICE Projects, part of the ONLYOFFICE suite, is an app created for everyone who wants to bring ease to project communication, keep up team productivity, get quick access to the assignments, and control progress.
Bugzilla is a web-based tool for planning, organizing and releasing software on your own schedule. It is used by many open source companies and projects, and has advanced features such as search, milestones, and products.
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It's a bilateral relation because redmine is first a good alternative to Mantis I prefer mantis for complex projects