The best open source alternative to Wrike is CryptPad. If that doesn't suit you, our users have ranked more than 100 alternatives to Wrike and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Wrike are Redmine (Free, Open Source), Taiga.io (Freemium, Open Source), OpenProject (Freemium, Open Source) and Kanboard (Free, Open Source).
CryptPad is a private-by-design alternative to popular office tools and cloud services. All the content stored on CryptPad is encrypted before being sent, which means nobody can access your data unless you give them the keys.
OpenProject is an open-source project management software with a wide set of features and plugins. It supports project timelines / Gantt charts, issue tracking, wiki, document management, time and cost reporting, code management, Scrum and much more.
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OpenProject vs Wrike opinions
pros, cons and recent comments
it is simple to use and perfect when you have a structure / PMO in your organization and don't want to have free style for the PM
Kanboard is a simple visual task board software. Kanboard is a free and open source Kanban project management software. There is no fancy user interface, Kanboard focus on simplicity and minimalism. The number of features is voluntary limited.
GanttProject is a cross-platform desktop tool for project scheduling and management. It runs on Windows, Linux and MacOSX, it is free and its code is opensource. What can it do? * Gantt chart. - Create work breakdown structure, draw dependencies, define milestones.
A Kanban-inspired app for keeping track of things that need to get done. The goal of TaskBoard is to provide a simple and clean interface to a functional and minimal application for keeping track of tasks. It's not trying to be the next Trello or LeanKit.