Free availability software for linux

MySQL High Availability clustering is a set of scripts and programs that provide a high availability database cluster using MySQL replication.
MySQL High Availability clustering is transparent to client applications, as the cluster uses a shared logical IP to provide the service.
Enhancements:
- References have been changed from MASTER_NODE to CLUSTER_IP in takeover, failover, and slave_routine, when it was appropiate.
- This release introduces changes in compat.sh, several main cluster files, and the installation documentation, according to bug reports 1707251 and 1707212.

Voltalinux is a GNU/Linux distro based on Slackware GNU/linux and the pkgsrc package system from NetBSD. The two pieces of software put together give you great power.
Great availability of software for a strong and solid distribution as Linux Slackware. The pkgsrc is already available to the linux user.
Now this project want to offer a prebuilt distribution with those feature readily available. Any user can enjoy the clean design of slackware with the availability of about 5400 ports (real ports) ready to be installed.
In minutes you can have running software such as postfix or courier, imap, qmail and so on.
The distro is a core based on about 60 packages from Slackware 10.2 and the pkgsrc 2005 Q3 (packaged for slack) system from NetBSD.
The advantage is that mantaining only few quantity of pieces it is possible to have a complete operating system (thanks to the existing work of many other, of course !!!)
The distribution is mainly intended for server use but you can do what you want.
Main features:
- is Slackware 100% compatible, whatever is done for slack work also on Voltalinux !!!
- you dont have to compile anything to have a working system (in about half an hour you have a base system)
- you have many prebuilt kernels
- more than 5400 ports ready to be used.
Version restrictions:
- you will have two packages system living together one for the core system (slack), the other for the applications (ports)

rdiald is an application which allows users from a local network to initiate dialup connections.
rdiald allows users in your home network to initiate a dialup connection to one of a freely configurable set of internet service providers on the server rdiald is running on. Multiple users can be online at the same time, and the connection is only terminated once the last user goes offline.
The users are allowed to execute any commands that have been defined previously on the server and to hang up as soon as these commands have finished.
Enhancements:
- improved handling of mulitple clients, especially during
- hang-up phase
- -i command-line option to bind to a specific interface only
- detection of a newly established dialup-link has changed:
- now a script that is started from ip-up is telling rdiald that the link is up, allowing a finer level of control as to when the link availability is broadcast to clients

MantaRay project is an innovative open-source data messaging project that was designed to address the continuously changing structure of todays IT environments. MantaRay uses a new approach ? peer-to-peer serverless architecture ? that allowed its development team to create a solution that is significantly more powerful and more efficient than traditional systems.
Being lightweight and OS-agnostic, MantaRay is ideal for heterogeneous, distributed, high-traffic environments. It is highly scalable, providing much faster performance than traditional messaging systems, such as buses and brokers. MantaRays serverless design can also help IT organizations dramatically reduce hardware and operational costs.
While traditional messaging systems such as brokers, buses and home-grown solutions were appropriate for monolithic IT environments, MantaRays design takes into account the continuously changing structure of todays IT environments. By using a peer-to-peer serverless architecture, it provides distributed environments with significantly faster performance and a higher level of robustness, as well as a comparatively rapid implementation time.
MantaRays flexible and lightweight design enables it to be embedded at the application level, thus bringing all functionality to the edges and eliminating the problem of having a single point of congestion and failure. The solution brings high reliability, scalability and availability to enterprise-grade messaging, and is capable of supporting multiple components, business partners, and locations.
The open-source, OS-independent, standards-based MantaRay solution combines cutting edge technologies such as XML, enterprise-grade communication services, and Service Oriented Architecture. Building on the MantaRay framework, developers can cost-effectively create real-time data messaging solutions that reliably connect applications and provide guaranteed delivery, security and transactions.
As a Java Messenger Service (JMS) provider, MantaRay is written in 100% pure Java, supports JMS 1.x & RMI APIs, provides TCP, UDP & SSL transports, and integrates with WebLogic & WebSphere. MantaRay features publish/subscribe (topic) and point-to-point (queue) messaging services, automatic discovery, persistent/non-persistent and durable messages, and message filtering using selectors.
Main features:
- Significantly faster messaging transport performance, particularly in high-traffic applications
- Theoretically infinite scalability
- No single point of failure or congestion
- Robust architecture, such that new applications can be added without changes to the other applications
- Support of heterogeneous environments
- Ease of use and fast deployment
- No application modification necessary
- No redesign of network topology required for every change
- Open source costs and low TCO
Enhancements:
- The MantaRay open source license has been changed to MPL instead of GPL
- High availability features have been fully tested and documented

ASPLinux is a modern multifunctional GNU/Linux distribution, includes all components for creation of a high perfomance Internet/Intranet server or powerful multimedia workstation.
Enhancements:
Some of the more prominent features of the new version include:
- simplicity - all the necessary applications are included and ready for use without any further configuration, irrespective of the purpose of the system;
- convenience - the presence of graphical configuration tools makes it easy to modify system settings, install and remove software, etc;
- broad multimedia support, including out-of-the box support for all popular video formats and availability of proprietary video drivers.
ASP Linux 11 uses kernel 2.6.14 and includes KDE 3.5.0, GNOME 2.12, Firefox 1.5 and Evolution 2.4.1

The Perl script testmail checks e-mail available at the POP3 server (including SSL), filters it according to the defined rules, and depending on the selected method gets the messages to the local mailbox and/or removes it from the server.
Testmail uses Perl Mail-POP3Client, Net-Ping, and Socket modules and helps you escape from spam.
Enhancements:
- This release allows the user to use SSL and a specifically selected port (for example, for a Gmail mailbox).
- Testmail now uses Mail-POP3Client module instead of the libnet module.
- Configuration files were changed to add PORT, USESSL, AUTH_MODE, and DEBUG options.
- Some rejecting rules were improved.

Websuite is a suite of simple CGI programs written in C, designed for speed, high availability, and support of name-based virtual hosts. I say that here because that seems to be the number one mistake made with these programs. If given no arguments or incorrect arguments, they will simply exit and expect weberror.cgi to tidy up behind them. The web
error daemon is the only way to find the error and fix it, it must be running. In this way, all error logging and reporting is collected in one place, rather than having template files and error reporting functions in every program.
Sample data and resource trees are now provided in documentation/examples, they may be copied verbatim and edited to suit. They may not be 100% up to date, so if the program complains about an error, the error message is exists surely.
Enhancements:
- Added unset to emailer.cgi
- Start to obsolete short modes from clock and countdown.

Wackamole is an application that helps with making a cluster highly available. The project manages a bunch of virtual IPs, that should be available to the outside world at all times. Wackamole ensures that a single machine within a cluster is listening on each virtual IP address that Wackamole manages.
If it discovers that particular machines within the cluster are not alive, it will almost immediately ensure that other machines acquire these public IPs. At no time will more than one machine listen on any virtual IP. Wackamole also works toward achieving a balanced distribution of number IPs on the machine within the cluster it manages.
Wakamole operates on a cluster of tightly connected machines (all on the same LAN). It works by managing a pool of IP addresses that you expect to be available at all times. These IP addresses are virtual (meaning no machine has any of those IPs as its default IP address). Wackamole will work to ensure that all of the IP addresses in the pool are assigned as virtual IPs to the machines in the cluster. No IP address is held by more than one machine and every IP address is available.
This allows you to run a service using multiple DNS RR records without the worry of one of the machines crashing -- if the machine crashes, the virtual IP addresses it was responsible for will be managed by the remaining machines in the cluster.
There is no other software like Wackamole. Wackamole is quite unique in that it operates in a completely peer-to-peer mode within the cluster. Other products that provide the same high-availability guarantees use a "VIP" method. A networking appliance assumes a single virtual IP address and "maps" requests to that IP address to the machines in the cluster. This networking appliance is a single point of failure by itself, so most industry accepted solutions incorporate classic master-slave failover or bonding between two identical appliances. These networking appliances can be:
- simple commodity servers running user applications to provide high availability,
- operating system features like IPVS under Linux or similar such features under Windows 2000 and FreeBSD,
- hardware networking component like Foundry ServerIron, Cisco LocalDirector or other content-aware switch, Cisco Arrowpoint content switched, Extreme Networks load-balancers and other such hardware products.
Enhancements:
- Many changes were made.