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SIL Software Catalog

This website contains archived materials provided for historical reference purposes only. The content and links are no longer maintained and may be outdated. SIL's current website is, and it includes a Software & Fonts section.

SIL has developed more than 60 pieces of software to support the work of its fieldworkers; most available to the public for free download. This on-line catalog contains product descriptions, download or purchasing instructions, and technical support information, including the latest SIL software Service Bulletins.

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Data Management
Text Analysis


syntactic analysis
tree diagrams


Other Windows software
Other Linux software
Other Macintosh software


Other Experimental software

Linguistic Tree Constructor (Experimental)

Current version: 3.0.4, released September 18, 2010

Linguistic Tree Constructor (LTC) is a tool for drawing syntax trees. Its intended audience is field linguists who need to do analyis of their texts above word-level. It supports three "styles" of trees:

The user interacts with the tree in a point-and-click fashion. The program does no analysis on its own, but instead lets the user decide how the tree should be constructed. The program makes sure, however, that the tree stays a tree.

LTC supports both Unicode (UTF-8) and non-Unicode data, in both left-to-right and right-to-left languages.

LTC imports "straight text" as well as word-per-record SFM files.

More about Linguistic Tree Constructor

Getting Linguistic Tree Constructor

Technical Support

Linguistic Tree Constructor support