List of Free code Algorithm
Projects

ALDA
Algorithms and data structures weekly assignments.

algorithm
Algorithm, data structure and java coding.

Algorithmic Trading API
Provides a better Java API for working with Interactive Brokers Online. Doesn't give any algorithms, but merely provides a more object oriented and script like approach to coding.

algorithms and data structures
This is a showcase for easily comprehensible implementations of standard algorithms and data structures taught at introductory CS courses.

AlgorithmsNYC
New York Algorithms and Data Structures Meetup repository.

Basic
Some basic stuff (algorithms, data structures, Google Code Jam).

big o
A collection of data structures and algorithms puzzles.

Caduceus
Set of example algorithm implementations focused on statistics and machine learning.

cs101
java impl of basic cs data structure and algorithms (for reviewing and teaching).

Data MiningClassifier
A text classifier based on Decision Trees ID3, Naive Bayes and KNN algorithm in C++ and JAVA.

Data StructuresAlgorithms
Revisiting Datastructures and Algorithms.

dsa
Data structures and algorithms that might be useful for ACM training.

GAHelloWorld
A simple example of a Genetic Algorithm that generates "Hello world!".

Interview java
Data structures && Algorithms Interview Questions in Java.

jAIL
a collection of mathematical data types and algorithms contained in one library.

RecordPlayer
Algorithms & Data Structures UC3M course 2011 2012 Assignment.

Ren D2
Research and Development 2 project, implementing a genetic algorithm to improve upon the K Nearest Neighbour algorithm by mutating the settings and sampled fraction of the training data.

TextClassification
A Text Classification API in Java originally developed by DigitalPebble Ltd. The API is independent from the ML implementations used and can be used as a front end to various ML algorithms. libSVM and liblinear are currently embedded.

TimeBench
foundational data structures and algorithms for time oriented data in Visual Analytics.

tunup
TunUp: A Parallel Genetic Auto Tuning system for Big Data Machine Learning algorithms.

yeslib
Misc apis and algorithms that can be used in other libs or projects.