一个非常有用的开源代码，包括几个常用的算法如聚类，傅立叶变换等等，用户可自由修改代码-a very useful source code, including several commonly used algorithms such as clustering, and so on Fourier transform, users are free to modify the code

开源的no-sql的数据库redis的2.6.13版本中，修改了intset的代码，增加了降级功能，可以减少内存的消耗。-Open source no-sql database redis the 2.6.13 version, modified intset code, increasing the degradation function, you can reduce memory consumption.

一个较高效率的SHA-1的C实现，VC2010使用X64编译，Release版本，比其它开源C代码大概快10 到20 -a high performance SHA-1 code in C. Compile by VC2010,in X64,release Version. It is guicker than others about 10 ~20

c hashset实现，一个c语言实现的hashtable开源代码-c hashset achieved a c language source code for hashtable