Free implementations software for linux

pypng 0.0.9 is an excellent and must-have product which offers you a Python module to decode (read) and encode (write) PNG files. All PNG formats are supported. Pure Python so that it can be installed as easily as possible and used on different Python implementations.

Procinfo NG is a ground-up rewrite of the procinfo program. Procinfo NGs goal is to make the code more readable (and reusable) and to restore broken functionality of the original program.
The original program was written for Linux 1.0, and updated through 2.2. This version is for 2.6.
Enhancements:
- Updates were made to match what some Linux distributions have done to procinfo-18.
- Support for MSI and XEN interrupts were added.
- Some non-x86 architectures are handled.
- Assorted bugs and 80-character console nonsense were fixed.

OntologyEngineI is a Perl interface a minimal Ontology implementation should satisfy.

This describes the minimal interface an ontology query engine should provide. It intentionally doesnt make explicit references to the ontology being a DAG, nor does it mandate that the ontology be a vocabulary. Rather, it tries to generically express what should be accessible (queriable) about an ontology.

The idea is to allow for different implementations for different purposes, which may then differ as to which operations are efficient and which arent, and how much richer the functionality is on top of this minimalistic set of methods. Check modules in the Bio::Ontology namespace to find out which implementations exist. At the time of writing, there is a SimpleOntologyEngine (which does not use Graph.pm), and a Graph.pm-based implementation in SimpleGOEngine.

Ontology parsers in Bio::OntologyIO are required to return an implementation of this interface.

libgee is a collection library providing GObject-based interfaces and classes for commonly used data structures.

The project provides Collection, Iterator, List, Iterable, Map, and Set interfaces and HashMap, ArrayList and HashSet implementations.

Objective Modula-2 programming language is a hybrid between Smalltalk and Modula-2 based on the object model and runtime of Objective-C.
The design is an example how native Cocoa/GNUstep support can be added to static imperative programming languages without implementing a bridge.
Objective Modula-2s scope encompasses the design of the Objective Modula-2 programming language and the implementation of a compiler to implement it. The initial compiler will generate Objective-C source code.
Enhancements:
- This code is used to verify ideas and concepts which come up in the course of defining the language.
- It is in an early stage, incomplete and subject to frequent changes.

Libp11 is a library that implements a small layer on top of PKCS#11 API to make using PKCS#11 implementations easier.
The official name for PKCS#11 is "RSA Security Inc. PKCS #11 Cryptographic Token Interface (Cryptoki)".
Libp11 source code include the official header files (version 2.20) and thus is "derived from the RSA Security Inc. PKCS #11 Cryptographic Token Interface (Cryptoki)".
Libp11 was written by an international team and is licensed as Open Source software.
Enhancements:
- The wiki export script was updated.
- RSA header files from RSA Labs (official) were replaced with those from Scute (open source).
- CKR_USER_ALREADY_LOGGED_IN is now allowed on C_Login.
- Internal functions were marked as static.
- Code for storing public keys and generating keys was added.

The OpenSCADA project aims to create a full-featured and state-of-the-art SCADA (Supervisory Control and Data Acquisition) system to be used in industrial and civil engineering applications to control distributed systems from a master location.
The OpenSCADA project was started in order to create a common standard for SCADA applications. This includes specifications, interfaces and reference implementations.
Enhancements:
- This release has many new features and enhancements to existing functionality.
- The interfaces and the reference implementation were cleaned up a little bit.
- The new upstream version of Utgard was added.