The best free alternative to Gantter is Asana. If that doesn't suit you, our users have ranked more than 100 alternatives to Gantter and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Gantter are Redmine (Free, Open Source), Kanboard (Free, Open Source), GanttProject (Free, Open Source) and Focalboard (Free, Open Source).
Whether you’re between meetings or in line for a latte, use Asana to quickly capture tasks, to-dos, reminders, and ideas. Get updates from coworkers, organize tasks and projects for work, or manage your to-do list for the day.
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.
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.