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Trollop is a commandline option parser for Ruby that gets out of your way. One line of code per option is all you need to write. For that, you get a nice automatically-generated help page (fit to your screen size!), robust option parsing, command subcompletion, and sensible defaults for everything you don't specify.

Versionomy is a generalized version number library. It provides tools to represent, manipulate, parse, and compare version numbers in the wide variety of versioning schemes in use.

Webby is a fantastic little website management system. It would be called a content management system if it were a bigger kid. But, it's just a runt with a special knack for transforming text. Webby works by combining the contents of a page with a layout to produce HTML. The layout contains everything common to all the pages HTML headers, navigation menu, footer, etc. and the page contains just the information for that page. You can use your favorite markup language to write your pages; Webby supports quite a few.

Shell Flags (shFlags) is a library written to greatly simplify the handling of command-line flags in Bourne based Unix shell scripts (bash, dash, ksh, sh, zsh) on many Unix OSes (Linux, Solaris, Mac OS X, etc.). Most shell scripts use getopt for flags processing, but the different versions of getopt on various OSes make writing portable shell scripts difficult. shFlags instead provides an API that doesn't change across shell and OS versions so the script writer can be confident that the script will work. shFlags is a port of the google-gflags C++/Python library.

Simian (Similarity Analyser) identifies duplication in Java, C#, C, C++, COBOL, Ruby, JSP, ASP, HTML, XML, Visual Basic Groovy source code and even plain text files. In fact, simian can be used on any human readable files such as ini files, deployment descriptors, you name it. Note: The port uses the java version by default. You can select the .NET version via WITH_MONO=yes, and disable installation of the java parts with WITHOUT_JAVA=yes.

SMACK is a low-level I/O storage library which packs data into sorted blobs, compressed with zlib, bzip2, or snappy. It was created to host huge amount of rather small compressible data in Elliptics, providing extremely fast write performance (tens of thousands RPS per node with hundreds of millions already written objects); its backend architecture was implemented with HBase in mind, but some changes were tested and made different. Data is compressed and sorted by key, that is, you get HBase-like scans for free (although this is not yet exported to Elliptics API).

STFL is a library which implements a curses-based widget set for text terminals. The STFL API can be used from C, SPL, Python, Perl and Ruby. Since the API is only 14 simple function calls big and there are already generic SWIG bindings it is very easy to port STFL to additional scripting languages. A special language (the Structured Terminal Forms Language) is used to describe STFL GUIs. The language is designed to be easy and fast to write so an application programmer does not need to spend ages fiddling around with the GUI and can concentrate on the more interesting programming tasks.

Apache Storm is a free and open source distributed realtime computation system. Storm makes it easy to reliably process unbounded streams of data, doing for realtime processing what Hadoop did for batch processing. Storm is simple, can be used with any programming language, and is a lot of fun to use! Storm has many use cases: realtime analytics, online machine learning, continuous computation, distributed RPC, ETL, and more. Storm is fast: a benchmark clocked it at over a million tuples processed per second per node. It is scalable, fault-tolerant, guarantees your data will be processed, and is easy to set up and operate.

Styx is a scanner/parser generator designed to address some shortcomings of the traditional lex/yacc combination. It has unique features like automatic derivation of depth grammar, production of the derivation tree including it's C interface, preservation of full source information and pretty printing to facilitate source-source translation, persistence to aid rapid interpreter writing. For application in contemporary computing environments, it supports unicode, reentrancy and offers thread-safeness.

Version Control with Subversion free book about the ubiquitous Apache. Subversion version control system and written by some of the developers of Subversion itself. If you like the book please consider to buy a printed version and support the subversion documentation project.