OpenOffice is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It is available in many languages and works on all common computers. It stores all your data in an international open standard format and can also read and write files from other common office software packages. Java is mainly required for the HSQLDB database engine (used by our database product Base) and to make use of accessibility and assistive technologies.

OpenOffice is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It is available in many languages and works on all common computers. It stores all your data in an international open standard format and can also read and write files from other common office software packages.

OpenOffice - leading open-source office software suite

Gnome Office consist of bunch of application such as Word, Speadsheet, Presentation, Graphics and Database. 

 AbiWord - Word processor (supports also OpenDocument Format). 
 Evince - Document viewer (official part of GNOME). 
 Evolution - Groupware and Email application (official part of GNOME). 
 Gnumeric - Spreadsheet application. 
 Inkscape - Vector Graphics and Presentation Creations 
 Ease - Presentations (using Clutter, in development) 
 GnuCash - financial application 
 gLabels - label designer 
 Glom - database designer similar to Filemaker 
 Dia - diagram creation

Gnome Office consist of bunch of application such as Word, Speadsheet, Presentation, Graphics and Database. 

Gnome Office -  office suite for GNOME 

Zettlr is an Electron-based app, A Markdown Editor for the 21st century. With Zettlr, writing professional texts is easy and motivating: Whether you are a college student, a researcher, a journalist, or an author — Zettlr has the right tools for you. It has a revolutionary search algorithm with integrated heatmap. It is available in over a dozen languages



Zettlr - A Markdown Editor for the 21st century.

KOffice consists of several applications that offer a specialized interface for a certain task to a generic set of content components. Its office suite includes word processing, spreadsheets, presentations, graphics, databases, project planning. 

 KWord is an intuitive word processor application with desktop publishing features. 
 KSpread is a fully-featured spreadsheet application. Use it to quickly create spreadsheets with formulas and charts, to calculate and organize your data. 
 KPresenter is a powerful and easy to use presentation application. You can dazzle your audience with stunning slides containing images, videos, animation and more. 
 Kexi for integrated data management. 
 KPlato for project planning. 
 Kivio for diagram­ming and flowcharting. 
 Karbon for drawing vector graphics. 
 Krita for painting and image editing.

KOffice consists of several applications that offer a specialized interface for a certain task to a generic set of content components. Its office suite includes word processing, spreadsheets, presentations, graphics, databases, project planning.

KOffice - office suite for KDE

Calligra-suite is a continuation of KOffice. The new name reflects the wider value of the KOffice technology platform beyond just desktop office applications. Currently all applications except Calligra Words will be maintained by their respective KOffice developers. 
 The Calligra Suite contains the following applications: 
 Words Word processor application evolved from KWord of KOffice 
 Tables Spreadsheet program, previously known as KSpread 
 Stage Presentation program, previously known as KPresenter 
 Flow Flowchart program, previously known as Kivio 
 Kexi Database application like Microsoft Access 
 Plan Project management application, previously known as KPlato 
 Krita Drawing application for multi-layered pixel-based images 
 Karbon Drawing application for multi-layered vector images

Calligra-suite is a continuation of KOffice. The new name reflects the wider value of the KOffice technology platform beyond just desktop office applications. Currently all applications except Calligra Words will be maintained by their respective KOffice developers.

Calligra-suite - a continuation of KOffice 

Etherpad lite is a really-real time collaborative editor spawned from the Hell fire of Etherpad. We're reusing the well tested Etherpad easysync library to make it really realtime. Etherpad Lite is based on node.js ergo is much lighter and more stable than the original Etherpad. Our hope is that this will encourage more users to use and install a realtime collaborative editor.

Etherpad - Web-based real time collaborative editor

APIs for manipulating various file formats based upon Open Office XML (ECMA-376) and Microsoft's OLE 2 Compound Document formats using pure Java. Apache POI is your Java Excel, Word and PowerPoint solution. We have a complete API for porting other OOXML and OLE 2 Compound Document formats and welcome others to participate.

Apache POI - Java API To Access Microsoft Document File Formats

Excelize is a library written in pure Go providing a set of functions that allow you to write to and read from XLSX / XLSM / XLTM / XLTX files. Supports reading and writing spreadsheet documents generated by Microsoft Excel™ 2007 and later. Supports complex components by high compatibility, and provided streaming API for generating or reading data from a worksheet with huge amounts of data.
 
With Excelize chart generation and management is as easy as a few lines of code. You can build charts based off data in your worksheet or generate charts without any data in your worksheet at all.

Excelize is a library written in pure Go providing a set of functions that allow you to write to and read from XLSX / XLSM / XLTM / XLTX files. Supports reading and writing spreadsheet documents generated by Microsoft Excel™ 2007 and later. Supports complex components by high compatibility, and provided streaming API for generating or reading data from a worksheet with huge amounts of data

Excelize - Golang library for reading and writing Microsoft Excel (XLSX) files

LibreOffice is the free power-packed Open Source personal productivity suite for Windows, Macintosh and Linux. LibreOffice is the perfect choice for home users, businesses, government and other organizations. It's native file format is the ISO standardized ODF (Open Document Format), but LibreOffice can open and save Microsoft Word, PowerPoint and Excel files, as well as many other formats, bringing you the widest-available compatibility with other products. It has 6 feature-rich applications for all your document production and data processing needs:
 
 <a title="Word processor" href="http://www.libreoffice.org/features/writer/">WRITER</a> is the word processor inside LibreOffice.Auto-completion, Auto-formatting and Automatic spelling checking makes your tasks easy. Writer is powerful enough to tackle desktop publishing tasks such as creating multi-column newsletters and brochures.
 
 <a title="Spreadsheet" href="http://www.libreoffice.org/features/calc/">CALC</a>is the spreadsheet inside LibreOffice. Analyze your data with Calc and then use it to present your final output. Charts and analysis tools help bring transparency to your conclusions. A fully-integrated help system makes easier work of entering complex formulas. Add data from external databases such as SQL or Oracle, then sort and filter them to produce statistical analyses. Use the graphing functions to display large number of 2D and 3D graphics from 13 categories, including line, area, bar, pie, X-Y, and net – with the dozens of variations available, you're sure to find one that suits your project.

<a title="Presentation" href="http://www.libreoffice.org/features/impress/">IMPRESS</a> is the fastest and easiest way to create effective multimedia presentations. It is similar to MS Powerpoint. Stunning animation and sensational special effects help you convince your audience. Create presentations that look even more professional than the standard presentations you commonly see at work.

<a title="Graphics editor" href="http://www.libreoffice.org/features/draw/">DRAW</a> lets you build diagrams and sketches from scratch. A picture is worth a thousand words, so why not try something simple with box and line diagrams? Or else go further and easily build dynamic 3D illustrations and special effects. It's as simple or as powerful as you want it to be.

<a title="Database engine" href="http://www.libreoffice.org/features/base/">BASE</a> is the database front-end of the LibreOffice suite. With Base, you can seamlessly integrate into your existing database structures. Based on imported and linked tables and queries from MySQL, PostgreSQL or Microsoft Access and many other data sources, you can build powerful databases containing forms, reports, views and queries. Full integration is possible with the in-built HSQL database.

<a title="Equation editor" href="http://www.libreoffice.org/features/math/">MATH</a> is a simple equation editor that lets you lay-out and display your mathematical, chemical, electrical or scientific equations quickly in standard written notation. Even the most-complex calculations can be understandable when displayed correctly. E=mc2.

LibreOffice is the free power-packed Open Source personal productivity suite for Windows, Macintosh and Linux. LibreOffice is the perfect choice for home users, businesses, government and other organizations. It's native file format is the ISO standardized ODF (Open Document Format), but LibreOffice can open and save Microsoft Word, PowerPoint and Excel files, as well as many other formats, bringing you the widest-available compatibility with other products.

LibreOffice - The Document foundation

Feng Office is a web based collaboration platform. It helps to manage your projects and business services, Collaborate with your team and your customers, Organize and share documents and files. Feng Office allows businesses to manage project tasks, billing, documents, communication with co-workers, customers and vendors, schedule meetings and events, and share every kind of electronic information. 

Feng Office allows you to store and share all types of documents. Text documents and presentations can be created or edited directly in Feng Office without the requirement of any additional software in your computer. Tasks and milestones could be tracked.

Feng Office is a web based collaboration platform. It helps to manage your projects and business services, Collaborate with your team and your customers, Organize and share documents and files. Feng Office allows businesses to manage project tasks, billing, documents, communication with co-workers, customers and vendors, schedule meetings and events, and share every kind of electronic information.

Feng Office -  A Collaboration Platform and online office

Joeffice is the first open source office suite written in Java. Its features include Docking system. Visualize several documents in the same window, It can have a lot of documents open at the same time and easily switch from one to another. It works with Microsoft document formats (docx, xslx, pptx). It can get data through web services (RMI, SOAP, REST).

Joeffice - Office Written in Java

Ferdi is a messaging browser that allows you to combine your favorite messaging services into one application. It is based on Franz - a software already used by thousands of people - with the difference that Ferdi gives you many additional features and doesn't restrict its usage. It natively support for 100+ services. 

Ferdi - A messaging browser that allows you to combine your favorite messaging services into one application

NeoOffice is a full-featured set of office applications including word processing, spreadsheet, presentation and graphics programs for Mac OS X. It is created by forking OpenOffice and added Mac specific features to it. NeoOffice Mobile application is available for Android devices, iPhone, iPad, and iPod touch.

NeoOffice - Office for Mac

JODConverter automates conversions between office document formats using OpenOffice.org or LibreOffice. Supported formats include OpenDocument, PDF, RTF, HTML, Word, Excel, PowerPoint, and Flash. It can be used as a Java library, a command line tool, or a web application. 


JODConverter - Automates document conversions using OpenOffice

ONLYOFFICE Desktop Editors is a free and open source office suite comprises text documents, spreadsheets and presentations allowing to create, view and edit documents of any size and complexity, to easily switch to the online mode for real-time co-editing and collaboration. Features as reviewing, commenting and chat are available as well. Deal with multiple files within one and the same window thanks to the tab-based user interface.
 
ONLYOFFICE Desktop Editors is fully compatible with MS Office and OpenDocument formats and allos you to work with most popular formats: DOC, DOCX, ODT, RTF, TXT, PDF, HTML, EPUB, XPS, DjVu, XLS, XLSX, ODS, CSV, PPT, PPTX, ODP.
 
The application also allows connecting third-party plugins, making it easy for developers to write their own extensions and add new features to the editors. Actually, you can create templates, add a video from YouTube, insert ClipArts, recognize text from screenshots/pictures, use photo editor, use Symbol Tabelle to insert special symbols, become multilingual with Yandex Translator or create your own one.
 
Desktop editors are a cross-platform solution available for Windows 10, 8.1, 8, 7, XP, Vista (x32 and x64), Debian, Ubuntu and other Linux distributions based on RPM, Mac OS 10.10 and newer. Besides platform-specific versions there is also a portable option.

ONLYOFFICE Desktop Editors is a free and open source office suite comprises text documents, spreadsheets and presentations allowing to create, view and edit documents of any size and complexity, to easily switch to the online mode for real-time co-editing and collaboration. Features as reviewing, commenting and chat are available as well. Deal with multiple files within one and the same window thanks to the tab-based user interface

ONLYOFFICE Desktop Editors - An office suite that combines text, spreadsheet and presentation editors allowing to create, view and edit local documents

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