Apps with 'Double Donut Chart' feature

Wekan, formerly LibreBoard, is an open-source and collaborative Trello -like kanban board application.

IPFS is a global, versioned, peer-to-peer filesystem. It combines ideas from Git, BitTorrent, Kademlia, SFS, and the web. It is like a single bittorrent swarm, exchanging git objects. IPFS provides an interface as simple as the HTTP web, but with permanence built in.

ChartEngine is a high-performance chart add-in for Excel and helps you tell a story using advanced charts, graphs, and widgets.

100% Free Excel Add-In for Waterfall, Gantt, QIGS, Mirror, BubbleX & Double Donut Charts and Live FX Rates. Also features usefull shortcuts and Excel-internal Web Browser. Supports 9 languages (EN,FR,DE,ES,TR,RU,AR,CH,IN).

Keikai is the only Web Spreadsheet designed and architected for big data — and is the fastest web spreadsheet regardless of size. Other advanced features include embeddable in your Web Apps, providing true Excel experiences and more.

Futuramo Time Tracker is a time tracking, work management and productivity app used by freelancers and businesses to track, analyze and manage work time more effectively. The advanced statistics provide great insights on daily work habits.