Best On-Premises Word Processors

ONLYOFFICE is an open-source project that offers cloud-based and self-hosted solutions for business of all sizes. The key product is ONLYOFFICE Docs, a secure office suite that seamlessly integrates into the most popular platforms, e.g. Odoo, Alfresco, Confluence, Pipedrive, Redmine, SuiteCRM and more. When integrated, ONLYOFFICE Docs provides the users of your business app with editors for documents, spreadsheets, presentations, forms, PDFs and diagrams. The ONLYOFFICE suite makes it possible to collaborate on office files in real time. The built-in AI assistant is compatible with ChatGPT, DeepSeek, Mistral and other AI providers to ensure a flawless editing experience. You can use Docs within ONLYOFFICE DocSpace, a room-based document collaboration platform that allows you to create dedicated spaces where you can assign access permissions and collaborate with your teammates. With DocSpace, you can store, share and co-edit office files, and even interact with third parties.

Collabora Online is excellent for enterprises that need a powerful office suite in the cloud, or on-premise, that protects their privacy and allows them to keep full control of their sensitive corporate data. Hosting and Cloud businesses who wish to include document viewing and collaborative editing functionality into their service offering can do this now with Collabora Online. View and edit text documents, spreadsheets, presentations & more. Works in any modern browser – no plugin needed. Preservation of layout and formatting of documents. Multiple deployment options. Admin console for monitoring system utilization. Key features are collaborative editing and excellent office file format support.

Truly Office Software is the #1 office productivity suite suitable for PC and mobile devices. It is a high-performing, multi-device that is considerably price friendly than alternatives. Truly Office is fully compatible and comparable to Microsoft PowerPoint, Excel and Word. Truly Office Suite is available for Windows and Linux-based PCs and Android and iOS. Truly Office is a privacy-first suite with a feature-rich comprehensive office suite with high compatibility. As a handy and professional office software, Truly Office allows you to edit files in Word, Slides, Sheet, and PDF to improve your work efficiency.

For customers who aren’t ready for the cloud, Office 2021 is the next on-premises version of Word, Excel, PowerPoint, Project, Visio, Access, and Publisher. Create presentations, data models, and reports with tools and capabilities like PowerPoint Morph, new chart types in Excel, and improved inking across apps. Manage your time, email, and contacts more easily with features like Focused Inbox, travel and delivery summary cards in Outlook, and Focus Mode in Word.

IceWarp is a business email and collaboration platform that brings Email, Calendar, TeamChat, Conferences, Files and online Documents into one place, so IT teams get fewer tools and simpler administration. Includes: Business email on your own domain, with shared calendars, tasks and contacts TeamChat with group spaces and file sharing Video and audio Conferences with recording and webinars for up to 1,000 attendees Online Office for real-time co-editing of documents, spreadsheets and presentations File storage and sharing, plus AI assistance Web, desktop and mobile apps, and Outlook Sync Run it in the cloud with a data center of your choice, on your own servers, or as a hybrid. Built-in migration tools move users from Microsoft 365, Google Workspace and Exchange.

Thinkfree Document Editor SDK, previously offered as Thinkfree Office, lets developers embed a full Office editor in web applications and control documents through object-level APIs. It supports Word, spreadsheet, and presentation editing for DOCX, XLSX, PPTX, and ODF files, without building an editing layer from scratch. The SDK is designed to work as part of an application rather than as a separate Office product. Applications can combine interactive editing with programmatic document operations and AI workflows, allowing users to review and continue editing in the same editor. • Embeddable Office editor UI for word processor, spreadsheet, and presentation documents • 900+ Object-level APIs for paragraphs, tables, ranges, sheets, charts, slides, and shapes • High-fidelity editing for DOCX, XLSX, PPTX, and ODF documents • Document tools that LLMs or AI agents can invoke • Real-time collaborative editing • Self-hosted deployment, or a Thinkfree-managed cloud API

Collabora Office brings the familiar Collabora Online experience to your computer - so you can create, edit, and present with a beautiful, modern UI. As with Collabora Online, Collabora Office is based on LibreOffice technology and backed by the largest team of LibreOffice developers worldwide, it delivers excellent interoperability with ODF and Microsoft Office formats (DOCX/XLSX/PPTX), and exports to PDF with ease. Your documents stay on your device unless you choose to share them - privacy by design.

WordCraft is a free, open-source word processor for people who write and format documents. Its ribbon interface provides editing and page-design tools for styles, tables, images, citations, footnotes, tables of contents, comments, and tracked changes, along with spelling and grammar checks and mail merge. It reads and writes DOCX, opens older DOC files, works with ODT, RTF, HTML, Markdown, LaTeX, and plain text, and exports PDF and page images. WordCraft runs as a native application on Windows, macOS, and Linux, and also has a WebAssembly edition that can be hosted on a static server. Its command-line tools, JSON control channel, and Model Context Protocol server support scripted and AI-agent document workflows. The software is in alpha, so file compatibility and feature coverage continue to develop.