Ranked in these QuestionsQuestion Ranking
Pro Free and open source
Pro Huge list of efficient and capable office components
Calligra consists of 9 tools. In addition to word-processing, spreadsheet and presentation software, it includes tools for project management, sketching/painting, database management, vector graphics, diagramming and brainstorming.
Pro Made for KDE
Designed in Qt for KDE plasma (but will also work in other DEs), hence the appearance is consistent with it.
Pro Calligra offers cutting edge applications for artists to work on 2D drawings and illustrations
Calligra includes Krita, a sketching and painting application, and Karbon, a vector drawing application. Both offer end-to-end solutions. Krita is also available as a standalone program.
Pro Unified design language
Con Subpar compatibility
Microsoft office proprietary formats are not always accurately rendered
Very bloated as it requires way too many dependencies to install. This is especially prominent in non-KDE desktops which may require over 100 dependencies to install.
Con Slow development
Development is slower and less active than competition.