OmegaT is a computer-assisted translation tool written in the Java programming language.

OmegaT runs on Linux, macOS, Microsoft Windows and Solaris, and requires Java 8.

According to a survey in 2010[3] among 458 professional translators, OmegaT is used 1/3 as much as Wordfast, Déjà Vu and MemoQ, and 1/8 as much as the market leader Trados.

It could translate unformatted text files, and HTML, and perform only block-level segmentation (i.e. paragraphs instead of sentences).

As with many open source projects, new versions of OmegaT are released frequently, usually with 2-3 bugfixes and feature updates each.

[6] OmegaT handles a translation job as a project, a hierarchy of folders with specific names.

When the user leaves a segment, OmegaT normally first adds the source-target pair to its database in memory.

At any point, the user can create partially translated versions of the source files.

Version 3.1 added a menu command (and keyboard shortcut) for limiting operation to the current file—for partial delivery or quick update, for example.

The file extension handling and preferred encoding can be customised to override default settings.

The Debian program po4a can convert formats such as LaTeX, TeX and POD to Gettext PO.

All the language files and all translations of the user manual are included in the standard distribution of OmegaT.

DGT maintains a fork of OmegaT (DGT-OmegaT) with adaptations/improvements/new features that meet DGT-specific requirements as well as a number of helper-applications to integrate OmegaT in its workflow: a Wizard to automate the creation, updating, revision and delivery of projects, Tagwipe to clean useless tags in docx documents and TeamBase to allow the sharing of memories in real-time.

[13] Latest update: 2017-02-28 Autshumato consists of a CAT tool, an aligner, a PDF extractor, a TMX editor, and a public TM based on crawled data.

Development is funded by the South African government's Department of Arts and Culture.

[15] Latest update: 2010-10-12 Boltran is a web-based tool that mimicks the workflow of an OmegaT project.