Themis is open-source high-level cryptographic services library for mobile and server platforms, providing secure messaging and secure data storage. Themis provides three important cryptographic services Secure messaging, Secure session and Secure storage. 
 
<ul>
<li>
Secure Message: a simple encrypted messaging solution for the widest scope of applications. Exchange the keys between the parties and you're good to go. Two pairs of the underlying crytosystems: ECC + ECDSA / RSA + PSS + PKCS#7. </li>
<li>
Secure Session: session-oriented, forward secrecy datagram exchange solution with better security guarantees, but more demanding infrastructure. Secure Session can perfectly function as socket encryption, session security, or (with some additional infrastructure) as a high-level messaging primitive. ECDH key agreement, ECC & AES encryption.</li>
<li>
Secure Cell: a multi-mode cryptographic container suitable for storing anything from encrypted files to database records and format-preserved strings. Secure Cell is built around AES in GCM (Token and Seal modes) and CTR (Context imprint mode).</li>
<li>
Secure Comparator: a Zero-Knowledge based cryptographic protocol for authentication and comparing secrets.</li>
</ul>

Themis is open-source high-level cryptographic services library for mobile and server platforms, providing secure messaging and secure data storage. Themis provides three important cryptographic services Secure messaging, Secure session and Secure storage. 

Themis - Crypto library for storage and messaging for ObjC, Android, C++, JS, Python, Ruby and PHP

Picocli is a one-file Java framework for parsing command line arguments and generating polished, easily tailored usage help messages. Java command line parser with both an annotations API and a programmatic API, featuring usage help with ANSI colors, autocomplete and nested subcommands. In a single file, so you can include it in source form. This lets users run picocli-based applications without requiring picocli as an external dependency.

picocli - a mighty tiny command line interface

Creating a new connection for each user can be time consuming (often requiring multiple seconds of clock time), in order to perform a database transaction that might take milliseconds. Opening a connection per user can be unfeasible in a publicly-hosted Internet application where the number of simultaneous users can be very large. Accordingly, developers often wish to share a "pool" of open connections between all of the application's current users.

DBCP - Java Database Connection Pooling library

Fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and queues with a small memory footprint and fast access and insertion. It also provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files. It has support of bidirectional iterators. It has support of Big arrays and Big Lists with 64 Bit indices.

Fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and queues with a small memory footprint and fast access and insertion. It also provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.

Fastutil - Fast & compact type-specific collections for Java

KeyczarKeyczar is an open source cryptographic toolkit designed to make it easier and safer for devlopers to use cryptography in their applications. Keyczar supports authentication and encryption with both symmetric and asymmetric keys. Keyczar was originally developed by members of the Google Security Team. 
 
Keyczar is designed to be open, extensible, and cross-platform compatible. It is not intended to replace existing cryptographic libraries like OpenSSL, PyCrypto, or the Java JCE, and in fact is built on these libraries.

KeyczarKeyczar is an open source cryptographic toolkit designed to make it easier and safer for devlopers to use cryptography in their applications. Keyczar supports authentication and encryption with both symmetric and asymmetric keys. Keyczar was originally developed by members of the Google Security Team. 

Keyczar - Toolkit for safe and simple cryptography

The serf library is a C-based HTTP client library built upon the Apache Portable Runtime (APR) library. It multiplexes connections, running the read/write communication asynchronously. Memory copies and transformations are kept to a minimum to provide high performance operation. serf 1.0.x is the default client library of Apache Subversion

Apache Serf - High-performance asynchronous HTTP client library

Apache MINA is a network application framework which helps users develop high performance and high scalability network applications easily. It provides an abstract, event-driven, asynchronous API over various transports such as TCP/IP and UDP/IP via Java NIO.

Apache MINA - A network application framework

Apache Commons Imaging, previously known as Apache Commons Sanselan, is a library that reads and writes a variety of image formats, including fast parsing of image info (size, color space, ICC profile, etc.) and metadata. It's slower, consequently, but perfectly portable. It's easier to use than ImageIO/JAI/Toolkit (Sun/Java's image support), supports more formats (and supports them more correctly). It also provides easy access to metadata. 

Apache Commons Imaging - Java Imaging Library

Commons RNG provides implementations of pseudo-random numbers generators that are either faster or of higher quality (and sometimes both) than java.util.Random. 

Apache Commons RNG - Random Numbers Generators

Essentials are a collection of general-purpose classes we found useful in many occasions. This project is bare bones compared to a rich menu offered by Guava or Apache Commons. Essentials is not a framework, it's rather a small set of utilities to make Java standard approaches more convenient or more efficient.
 
<ul>
<li>IO utilities help with streams (byte and character based) and digests (e.g. MD5 and SHA-1).</li>
<li>File utilities simplify reading and writing strings/bytes/objects from or to files. Also includes getting hashes from files and copying files.</li>
<li>String utilities allow efficient splitting and joining of strings, hex and MD5 creation, and other useful string helpers. Date utilities.</li>
<li>Better hash functions: Murmur3 implementation provides superior hash quality and outperforms standard Java hash functions</li>
<li>Specialized Streams: for example an optimized PipedOutputStream replacement (based on a circular byte buffer)</li>
<li>Hash set and map for primitive long keys outperform the generic versions of the Java Collection APIs</li>
<li>Multimaps provide a map of lists or sets to simplify storing multiple values for a single key</li>
<li>Object cache with powerful configuration options: soft/weak/strong references, maximum size, and time-based expiration</li>
<li>Base64 implementation (bundled from iharder.net) for lower versions of Java &amp; Android (includes input/output streams)</li>
</ul>

Essentials are a collection of general-purpose classes we found useful in many occasions. This project is bare bones compared to a rich menu offered by Guava or Apache Commons. Essentials is not a framework, it's rather a small set of utilities to make Java standard approaches more convenient or more efficient.

Essentials - General purpose utilities and hash functions for Android and Java (aka java-common)

The Apache Tika toolkit detects and extracts metadata and text from over a thousand different file types (such as PPT, XLS, and PDF). All of these file types can be parsed through a single interface, making Tika useful for search engine indexing, content analysis, translation, and much more.

Apache Tika - A content analysis toolkit

Quartz is a full-featured, open source job scheduling service that can be integrated with, or used along side virtually any Java EE or Java SE application - from the smallest stand-alone application to the largest e-commerce system. Quartz can be used to create simple or complex schedules for executing tens, hundreds, or even tens-of-thousands of jobs; jobs whose tasks are defined as standard Java components that may executed virtually anything you may program them to do. The Quartz Scheduler includes many enterprise-class features, such as JTA transactions and clustering. If your system has recurring maintenance jobs then Quartz may be your ideal solution. 

 Its major features include: 
 <UL>
	<LI>Job Scheduling, Jobs are scheduled to run when a given Trigger occurs</LI>
	<LI>Job Execution</LI>
	<LI>Job Persistence</LI>
	<LI>Quartz can participate in JTA transactions</LI>
	<LI>Supports Fail-over, Load Balancing</LI>
 </UL>

Quartz is a full-featured, open source job scheduling service that can be integrated with, or used along side virtually any Java EE or Java SE application - from the smallest stand-alone application to the largest e-commerce system.

Quartz - A full-featured, Java-based, In-process job scheduler

PyAlgoTrade is a Python Algorithmic Trading Library with focus on backtesting and support for paper-trading and live-trading. Let’s say you have an idea for a trading strategy and you’d like to evaluate it with historical data and see how it behaves. PyAlgoTrade allows you to do so with minimal effort. 
<ul>
<li>Event driven.</li>
<li>Supports Market, Limit, Stop and StopLimit orders.</li>
<li>Supports any type of time-series data in CSV format like Yahoo! Finance, Google Finance, Quandl and NinjaTrader.</li>
<li>Bitcoin trading support through <a href="https://www.bitstamp.net/" target="_blank" rel="nofollow">Bitstamp</a>.</li>
<li>Technical indicators and filters like SMA, WMA, EMA, RSI, Bollinger Bands, Hurst exponent and others.</li>
<li>Performance metrics like Sharpe ratio and drawdown analysis.</li>
<li>Handling Twitter events in realtime.</li>
<li>Event profiler.</li>
<li>TA-Lib integration.</li>
</ul>

PyAlgoTrade is a Python Algorithmic Trading Library with focus on backtesting and support for paper-trading and live-trading. Let’s say you have an idea for a trading strategy and you’d like to evaluate it with historical data and see how it behaves. PyAlgoTrade allows you to do so with minimal effort. 

PyAlgoTrade - Python Algorithmic Trading Library

Ristretto is a fast, concurrent cache library built with a focus on performance and correctness. Its features include Concurrency, High Hit Ratios, Fast Throughput, Cost-Based Eviction, Metrics support.

Ristretto - A high performance memory-bound Go cache

jRSS is a simple java API to produce Really Simple Syndication (RSS) documents following the specification version 2.0. This library provides only support to generate RSS feeds.

JRss

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