For a bunch of philosophical and practical reasons, we have decided to migrate the task management system of Dokeos from Flyspray to Redmine.
This is the result of a short time of analysis and of months of small problems. Our reasons to go to Redmine:

• integrated time management, allowing for the evaluation of time per project
• integrated Gantt charts support, allowing for a better planning of human resources over projects
• more flexible management by project (including sub-projects)
• easy links to (code) version management systems like Git, Subversion, Mercurial, etc
• possibility to execute commands via e-mail (which permits, indirectly, to work offline using a stack of e-mails)
• a more appeasing visual look (we developers are already stressed enough by the urgent tasks to have to bear red glowing urgent notifications)
• more complete and visible dashboards (although this could still be improved a lot)
• a friendlier community (this is a subjective parameter, but has influenced a lot our will to improve Flyspray)

Despite these positive elements, we still miss the per-task visibility feature (current visibility is by project), which we understand is under way but is a omplicated conceptual matter.
We are currently working on the publication of a neutral version of the migration script to GPL, so that others can benefit from the effort.
The new task management system of Dokeos will be available from this Monday at https://support.dokeos.com
While the thing is still warm, we will also help two other businesses get their Flyspray migrated to Redmine in a matter of weeks.