When comparing Waffle.io vs Kantree, the Slant community recommends Kantree for most people. In the question“What is the best task management software for small teams?” Kantree is ranked 9th while Waffle.io is ranked 41st. The most important reason people chose Kantree is:
Kanban board to drag and drop cards across columns. Select which group type to show as columns: status, milestones, labels, teams, etc (you can create your own dimensions) Set rules to your group (such like auto-assign card to user when dropping a card)
Specs
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Pros

Pro Free for public repos
Any public GitHub repositories can use the software for free.

Pro Links GitHub issues with a Kanban board
Existing GitHub issues can be used to create tasks and managed in a more convenient Kanban style.

Pro Real-time
Each update is visible as soon as it is made.
Pro Dynamic kanban view
Kanban board to drag and drop cards across columns.
Select which group type to show as columns: status, milestones, labels, teams, etc (you can create your own dimensions)
Set rules to your group (such like auto-assign card to user when dropping a card)
Pro Infinite hierarchy
Cards can have checklists. Items in the checklist are actual cards, which can be organized in their own board.
Projects is like a tree of card, with unlimited sub-level boards. Perfect to manage complex project with hierarchy. You can choose different settings and user permissions at every level.
Pro Custom card groups
Group your card in unlimited dimensions.
You can use the built-in groups (lists, labels, milestones), adapt them or create your own.
This allows you to manage a projects in other dimensions (by versions, teams, offices, categories, releases, etc).
Visualize your project in kanban and table view, by the group types of your choice.
Drag and drop cards quickly between groups.
Track progress by group types (ideal for managing iterations).
Pro Self-hosted option
Kantree can be installed on your server #privacy
Pro Card models
Use or create card model to best represent your work, for each of your project.
Dozens of types of attributes available, including text, yes/no values, map, file attachments, due date, etc
Perfect to manage projects of different kinds, with multiple card types - like ideas, sales contact, customer feedback, bug report, feature request, bill/order.
Pro Notification (email and in-app)
Pro Slack integration
Pro Github integration
Pro Charts and analytics
Pro Work in progress limits
Set soft limit to group, so that your teams don't get overloaded and lose focus
Pro Mobile
Adaptative design that is optimize for touch-based interface and adapt the UI to small screen (mobile and tablet)
Pro Table view
Manage your cards in table, by groups.
All the cards are displayed as rows, with their attributes in columns.
Group cards by any group type: milestones, status, team, label, epic, release...
Drag and drop cards across groups.
Pick the attributes to include in the table
Pro Card links
Create linked card to mirror a card in another projects / organization.
Create links with the attributes of the target card, or with its own attributes (to manage a card in multiple boards)
Create custom card relationship: blocked by, same as, etc.
Kantree also support infinite card hierarchy
Pro File attachment
Drag and drop multiple files to your cards at once.
Preview files in a gallery, by card or for the entire project
Cons
Con Managing large project may be difficult
Waffle works best with medium to small projects and very high-level general overviews and less with projects that require very granular management due to the fact that it becomes considerably more difficult to keep track of various cards and priorities as they are pushed off screen very quickly.
Con Its not project management...
