Nix, the purely functional package manager

A concise grammar of interactive graphics, built on Vega.

Kaitai Struct: declarative language to generate binary data parsers in C++ / C# / Go / Java / JavaScript / Lua / Nim / Perl / PHP / Python / Ruby / Rust

A simple, lightweight, flexible, embeddable, portable and multi-paradigm dynamic programming language for developing applications, tools, and domain-specific languages

NixOS Guide. Learn all about the immutable Nix Operating System and the declarative Nix Expression Language.

BinData - Reading and Writing Binary Data in Ruby

Logic programming in Rust

Logtalk - declarative object-oriented logic programming language

QML to Javascript/HTML5 translator. Ready for Mobile, Desktop and SmartTV platforms.

A declarative drawing API in Python

Declarative Gradle is a project targeting better isolation of concern and expressing any build in a clear and understandable way

A realtime visual programming language for interactive media.

Interactive details-on-demand data visualizations at scale

Kumi is a declarative rules-and-calculation DSL for Ruby that staticaly analyzes and compiles your business logic.

Triton Operating System

A dynamic blog engine written in pure Prolog. Zero dependencies, built-in Markdown support, and a prolog HTTP server.

Infrastructure as Natural Language

re<urse is a declarative language for generating musical patterns

Caption Markup Language

Embeddable Prolog dialect implemented in pure Python. Stores its knowlegdebase using SQLAlchemy for scalability.