todoyu is described as 'extendable, web-based, open source project and task management system. It is geared to the needs of SMEs, tailored to project-related work and suitable for agencies, consultants, architects or lawyers' and is an app in the Office & Productivity category. There are more than 50 alternatives to todoyu for a variety of platforms, including Online / Web-based, Windows, Mac, Android and iPhone. The best alternative is Google Calendar, which is free. Other great apps like todoyu are Redmine (Free, Open Source), Basecamp (Freemium), Wrike (Freemium) and GanttProject (Free, Open Source).
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.
Huddle is online collaboration & content management for the enterprise. It gives you a network of secure online workspaces where you can store & share files, collaborate on documents, manage tasks & create discussions.
GQueues is the premier task manager for Google and G Suite users. GQueues tracks millions of tasks for people, companies and organizations worldwide. Designed with a focus on simplicity, GQueues stays out of your way so you can get things done.
5pm is a web based project management application with a smart customizable interface. Email integration, iCalendar and RSS feeds, Timeline view and Reports are just a few features to mention. Free trial (no credit card required) is available.
This is online project management web application for personal or business usage. There is a dashboard, project and task lists, messaging system, advanced reports and many other useful features. You can collaborate with your co-workers easily.