Download of Grammatica 7.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is an intellectual property of Ultralingua.
The application's installer is commonly called Grammatica-en.dmg.gz or grammatica-1.5.zip etc. The most popular versions of the tool are 7.1 and 7.0. The software is included in Productivity Tools. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
Grammatica is a C# and Java parser generator (compiler compiler). It improves upon simlar tools (like yacc and ANTLR) by creating well-commented and readable source code, by having automatic error recovery and detailed error messages, and by support for testing and debugging grammars without generating source code. Grammatica supports LL(k) grammars with an unlimited number of look-ahead tokens.
You may want to check out more software for Mac, such as pdf-Recover, Mac Notepad or Apimac Clean Text, which might be similar to Grammatica.
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