Freebase

Link: https://www.freebase.com/
API:
1) https://developers.google.com/freebase/data
2) http://wiki.freebase.com/wiki/Open_source

Wikipedia Extractor

Link: http://medialab.di.unipi.it/wiki/Wikipedia_Extractor

Intro: WikiExtractor.py is a Python script that extracts and cleans text from a Wikipedia database dump. The output is stored in a number of files of similar size in a given directory. Each file contains several documents in the document format.

Charset Detector Tool in Java

Link: http://sourceforge.net/projects/jchardet/
Intro: chardet is a java port of the source from mozilla's automatic charset detection algorithm.

TempoWordNet

Link: https://tempowordnet.greyc.fr/ 

Intro: TempoWordNet is a free lexical knowledge base for temporal analysis where each synset of WordNet is assigned to its intrinsic temporal values. Each synset of WordNet is automatically time-tagged with four dimensions : atemporal, past, present and future.

Cross-platform Programming

Some cross-platform programming IDE & tools:

1) Code::Blocks (an alternative to Microsoft VC++ IDE in Linux or even Windows): http://www.codeblocks.org/
2) wxWidgets (cross-platform GUI programming library): http://www.wxwidgets.org/downloads/
3) ...

RegEx online

Link: http://regex101.com/
Intro: a great online tool for testing your regular expression.
Complete Tutorial: http://www.princeton.edu/~mlovett/reference/Regular-Expressions.pdf

Some useful C++ programming libaries

1) http://partow.net/programming/
2)