When comparing Calligra vs Abiword + Gnumeric + Dia (formerly GNOME Office), the Slant community recommends Calligra for most people. In the question“What are the best office suites for UNIX-like systems?” Calligra is ranked 6th while Abiword + Gnumeric + Dia (formerly GNOME Office) is ranked 10th. The most important reason people chose Calligra is:
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.
Specs
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Pros
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 Free and open source
Pro Unified design language
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 Made for KDE
Designed in Qt for KDE plasma (but will also work in other DEs), hence the appearance is consistent with it.
Pro Lightweight
Both AbiWord & Gnumeric are designed with low resource consumption in mind. As such they are great applications for older computers.
Pro Great import/export features
Pro Free and open-source
Pro Straight forward
'Old' style menu structure is lovely to support users.
Pro Multilingual
Over 30 languages are supported.
Pro Collaborative editing
Abiword is able to edit online collaborative documents.
Cons
Con Bloated
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 Subpar compatibility
Microsoft office proprietary formats are not always accurately rendered
Con Slow development
Development is slower and less active than competition.
Con Almost abandoned
Very few updates and bug fixes.
Con Default format is only readable with Gnumeric
Gnumeric is able to read/write a lot of file formats including ODS, XLS, XLSX, but it's default .gnumeric format is only readable with Gnumeric.
Con AbiWord has a dated aesthetic
The interface hasn't had a facelift since it's inception in 1998.
Con File interchangability
You may like it or not, but this is an O365 dominated world. And at some time you will need to send somebody the result of your work digitally. Then not being able to share a compatible file format is a pain. Even if your application is great and light (which it is).