License & Deployment Mix: 15 tools – 5 OSS, 7 SaaS. (OSS and SaaS counts can overlap when an open-source tool also offers a vendor-hosted edition.)

What Is Translation & Localization Software?

Translation and localization software manages the process of adapting content – user interfaces, documentation, marketing materials, legal texts – into multiple languages and regional variants. The category spans several tool types:

• TMS (Translation Management System) – a web-based platform that orchestrates translation workflows, assigns work to translators, tracks progress, and stores completed translations
• CAT tool (Computer-Assisted Translation) – a desktop or web application that helps translators work segment by segment, leveraging translation memory (TM) and terminology databases
• String manager – a developer-focused platform for managing translatable strings extracted from source code (JSON, YAML, PO/gettext, XLIFF, Android XML, iOS .strings)
• Continuous localization – integration with version control (Git) to automatically detect new or changed strings and route them for translation

Core Concepts

• Translation memory (TM) – database of previously translated segments. When a new segment matches or fuzzy-matches an existing translation, the TM suggests it, improving consistency and reducing cost. Standard exchange format: TMX (Translation Memory eXchange)
• Term base / glossary (TB) – controlled vocabulary ensuring consistent translation of key terms. Standard exchange format: TBX (TermBase eXchange)
• XLIFF (XML Localization Interchange Format) – the OASIS standard for exchanging translatable content between tools. Version 2.0 is current; many tools still support XLIFF 1.2
• SDLXLIFF – Trados-specific variant of XLIFF; widely used because of SDL Trados market dominance
• PO / gettext – the GNU gettext format (.po / .pot files), standard in open-source software localization
• ICU MessageFormat – syntax for pluralization, gender, and variable interpolation in translated strings
• Machine translation (MT) – integration with DeepL, Google Translate, or custom MT engines to provide draft translations for human post-editing
• In-context editing – visual editing where translators see their translations rendered in the actual application UI
• QA checks – automated validation of translations (missing placeholders, double spaces, inconsistent terminology, length violations, untranslated segments)
• Workflow management – multi-step processes (translate, review, proofread, approve) with role assignments and status tracking

Translation Package Concepts

A translation package is a self-contained bundle of source content, translation memory, and terminology that can be sent to an external translator or contractor. The round-trip workflow:

1. Prepare source – extract translatable content from the application, website, or document
2. Create package – bundle source segments with TM matches, term bases, and instructions into a distributable format (XLIFF, SDLXLIFF, TMX, or a proprietary package format)
3. Send to translator – deliver the package to a freelance translator, agency, or contractor
4. Translator works – the translator opens the package in their CAT tool, translates segments, and exports the completed package
5. Import completed work – import the returned package back into the TMS or CAT tool
6. Review / QA – run QA checks, have a reviewer approve or reject segments
7. Publish – merge approved translations into the application or content system

Common package formats:

The information on these pages was researched by a combination of human review and large language models. To suggest an addition or correction, please contact us. Prepared by Rhodium Systems Inc., author of the ResorsIT platform — a unified IT operations management platform for IT teams and MSPs that integrates a curated suite of open-source, commercial, and SaaS applications into a single system with shared identity, single sign-on, access control, and a common audit trail. Use this catalogue only as a starting point for your own research, and review any tool carefully against your own requirements before relying on it. Catalogue data version 2026.197.

Comparison

Tool Categories

Feature Matrix

Core Translation Features

* = Cloud TM in Pro version only

File Format Support

Translation Package Format Support

Key observations:

• Desktop CAT tools (Trados, memoQ, Wordfast) have the most robust package workflows with dedicated package formats
• Web TMS tools (Weblate, Crowdin, Transifex) prefer in-platform translation but support XLIFF export for offline work
• Trados .sdlppx is the industry-standard package format for professional translation
• XLIFF is the universal interchange format supported by all tools

Deployment Comparison

* = pontoon.mozilla.org is the primary instance ** = GroupShare (server) and Trados Live (cloud) are separate products *** = Crowdin Enterprise offers dedicated hosting

Licensing Comparison

SSO / OIDC Comparison

OIDC is the preferred SSO protocol; the Authentik notes below assume an OIDC/SAML identity provider.

* = Trados Live/GroupShare; desktop has no SSO ? = not publicly documented

Best SSO support: Weblate (OIDC on all tiers), memoQ Server, and Smartling offer the broadest SSO support. Most cloud platforms restrict OIDC/SAML to enterprise tiers.

API Comparison

* = Trados Live API; GroupShare API is separate

Continuous Localization Support

* = Git/SVN team projects for shared work ** = GDN provides CDN-based delivery, not OTA SDK

Suitability Summary

For MSP Customer Support

• Self-hosted TMS: recommend Weblate for customers wanting on-premise localization
• Cloud TMS: recommend Crowdin or Lokalise for developer teams; Smartling for enterprise content-heavy organizations
• Desktop CAT: Trados and memoQ are the industry standards for document translation; OmegaT and Wordfast are cost-effective alternatives
• Simple needs: POEditor for small teams with limited budgets
• SSO integration: Weblate (all tiers), memoQ Server, Crowdin Enterprise, Smartling

Package Workflow Comparison

For organizations that need to send work to external translators/contractors:

• Best package workflow: SDL Trados (sdlppx/ sdlrpx) – industry standard; most polished round-trip experience
• Best server workflow: memoQ Server – WebTrans for browser-based translator access

• package fallback

• Best cloud workflow: Crowdin or Phrase TMS – invite translators to web editor; XLIFF export for offline work
• Best OSS workflow: Weblate – web-based translation + XLIFF/PO export for contractors

Tools

15 tools.

Crowdin

Crowdin is a developer-friendly cloud localization platform designed for software teams. It is one of the most popular tools for translating applications, games, documentation, and websites, with over 1.5 million users.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML

Website

LingoHub

LingoHub is a cloud-based continuous localization platform designed for agile software development teams.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML

Website

Lokalise

Lokalise is a cloud-based translation management system for product teams and developers, with translation memory, glossary, 50+ file formats, machine translation, Git and Figma integration, and OTA delivery.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML

Website

Lokalize

Lokalize is KDE’s official translation tool, designed for translating KDE software and documentation.

License: GPL-2.0-or-later (OSS) · Kind: web · Deploy: package · SSO: none

Website · Source

memoQ

memoQ is a proprietary computer-assisted translation tool with desktop and server editions, offering translation memory, terminology management, QA checks, and interoperability with Trados and XLIFF files.

License: Proprietary (proprietary) · Kind: web · Deploy: saas, native, package · SSO: none

Website

OmegaT

OmegaT is a free, open-source desktop CAT tool written in Java. It has been in active development since 2000 and is widely used by freelance translators, localization teams, and organizations that need a cost-free professional translation e…

License: GPL-3.0-only (OSS) · Kind: web · Deploy: saas, package · SSO: none

Website · Source

Phrase TMS

Phrase TMS (formerly Memsource) is a cloud-based translation management system that combines TMS project management with an integrated web-based CAT editor.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML

Website

Poedit

Poedit is a lightweight desktop translation editor focused on PO/gettext files. It is the most popular tool for translating WordPress themes and plugins, PHP applications, and other software that uses the GNU gettext localization framework.

License: MIT (OSS) · Kind: web · Deploy: saas, package · SSO: none

Website · Source

POEditor

POEditor is a simple, affordable cloud-based translation management platform designed for small to mid-size software teams.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Pontoon

Pontoon is Mozilla’s open-source localization platform, built to manage translations for Firefox, Mozilla.org, and other Mozilla projects.

License: BSD-3-Clause (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

SDL Trados Studio

SDL Trados Studio (now branded as Trados Studio by RWS) is the dominant desktop CAT tool in the professional translation industry, holding approximately 40% market share.

License: Proprietary (proprietary) · Kind: web · Deploy: saas, native, package · SSO: none

Website

Smartling

Smartling is an enterprise-grade cloud translation management platform designed for organizations with large-scale, content-heavy localization needs.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML

Website

Transifex

Transifex is a cloud localization platform for software and content translation, with translation memory, glossaries, 30+ file formats, machine translation, and a code-first Transifex Native SDK.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML

Website

Weblate

Weblate is the leading open-source continuous localization platform. It integrates directly with version control systems (Git, Mercurial, SVN) to automatically detect new or changed strings and present them for translation in a web-based ed…

License: GPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: OIDC, SAML

Website · Source

Wordfast

Wordfast is a family of proprietary CAT tools spanning the cross-platform Wordfast Pro desktop app, the Wordfast Classic Word add-in, and cloud-based Wordfast Anywhere, with translation memory and QA checks.

License: Proprietary (proprietary) · Kind: web · Deploy: saas, package · SSO: none

Website