Free reliable internet software for linux

Reliable Response Notification provides guaranteed delivery of critical messages to a wide range of devices. The project guarantees that every emergency will have one, and only one, person responding and taking charge of the recovery.
For integrated services, like some network monitors, help-desk packages, and security suites, Reliable Response Notification allows the user to update records via their mobile devices. It is available as either a standalone server or as a hosted service.
Enhancements:
- The product supports three types of groups: broadcast, escalation and on-call.
- Many devices are supported, including email, SMS, text-to-speech, Jabber, GTalk, SameTime IM, and alphanumeric pagers.
- Integrations for a number of packages are available.
- There is an easy system to add new integrations as needed.

ALTSE is an alternative search engine technology.

It can index up to a couple million Web sites.

A search engine is a program designed to help find information stored on a computer system such as the World Wide Web, or a personal computer.

The search engine allows one to ask for content meeting specific criteria (typically those containing a given word or phrase) and retrieves a list of references that match those criteria.

Search engines use regularly updated indexes to operate quickly and efficiently. Without further qualification, search engine usually refers to a Web search engine, which searches for information on the public Web.

Other kinds of search engine are enterprise search engines, which search on intranets and personal search engines, which search individual personal computers.

Some search engines also mine data available in newsgroups, large databases, or open directories like DMOZ.org. Unlike Web directories, which are maintained by human editors, search engines operate algorithmically.

Most web sites which call themselves search engines, are actually front ends to other search engines owned by other companies. The typical user will often not know which underlying search engine they are using.

Distributed Internet Backup System works by doing all its communication through email. The benefit of using email for transport is that clients behind firewalls or with intermittent connections to the Internet can use DIBS reliably.
Since disk drives are cheap, backup should be cheap too. Of course it does not help to mirror your data by adding more disks to your own computer because a virus, fire, flood, robbery, power surge, etc. could still wipe out your local data center.
Instead, you should give your files to peers (and in return store their files) so that if a catastrophe strikes your area, you can recover data from surviving peers. The Distributed Internet Backup System (DIBS) is designed to implement this vision.
Note that DIBS is a backup system not a file sharing system like Napster, Gnutella, Kazaa, etc. In fact, DIBS encrypts all data transmissions so that the peers you trade files with can not access your data.
Enhancements:
- Added Peer Finder service to allow advertising and automated exchange of peering information. See manual for details.
- Updated add_peer and edit_peer commands to allow sizes to be specified using k, m, g, t (e.g., 10k, 10m, 10g, 10t).
- Updated the protocol DIBS uses to exchange store, unstore, probe, and other messages between peers. The new protocol is XML based to allow easier debugging, parsing, and extensions.
- Fixed a deadlock bug reported by Jason Martin in a message to the dibs-discussion mailing list.
- Made the daemon run its periodic checks like spawnning auto_check, process_message, etc., as soon as it starts up.
- Other minor bug fixes and improvements