A F/OSS natural language translation system that seems to want to give Google Translate a run for its money. The corpuses used for training appear to be crowdsourced, and I think you can download the trained models on their own. Aims to be self-hosted.
spaCy is a library for advanced Natural Language Processing in Python and Cython. It's built on the very latest research, and was designed from day one to be used in real products. spaCy comes with pre-trained statistical models and word vectors, and currently supports tokenization for 45+ languages. It features the fastest syntactic parser in the world, convolutional neural network models for tagging, parsing and named entity recognition and easy deep learning integration. It's commercial open-source software, released under the MIT license.
A utility that, when given a grammar and syllable system, can generate words and phrases in languages that don't yet exist. This is meant as a utility for linguists for studying languages, but I can see applications for gamers, specifically prop-makers.
A publisher reprinting rare, forgotten, and unusual texts. Download them as .pdfs or purchase them online. Many categories are represented, from epic sagas to classical fiction, drama to architecture, history to technology.
A massive list of free-as-in-beer ebooks about programming: Languages, platforms, tools, and more. Ideal for teaching classes, continuing education, reference, and getting a jump start on programming in school.
A very well done description of decorators in python. Go in depth about how functions are first class objects, scope, self-modifying code, and how everything works. programming languages documentation tutorial
An offline version of the Khan Academy. Replicates the experience of the online classrooms. Watch videos, do exercises, track student progress. Can be customized. Use at home, in classrooms, or to create entire schools. Supports ten different languages now.