Best alerting software for free download

Save you data before HDD failure destroys it. SIGuardian uses S.M.A.R.T technology to accurately predict the date when a hard-drive is no longer safe to use. This tool is also capable of monitoring HDD temperature and alerting you over the network.
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Quickly & easily monitor your IIS servers, web & FTP site access, TCP/IP ports, key services, system performance & errors written to log file. Built-in alerting, automatic corrective action & web reports.
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This clear, easy to use and light-weight secure IM client designed for instant alerting and urgent messaging for use in a business and corporate environment. The messaging server provides IM logging, user grouping, offline and scheduled messaging.
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Mail Snoop Pro is an anti-spam and email notification application designed to monitor any number of Pop3/SSL Pop3/IMAP/SSL IMAP mailboxes, finding and deleting spam without disturbing you and alerting you when there is new mail you need to see
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Managing a network? If so, you need to make sure that all services, mail, web, and database servers are always up and running. NetVision discovers the network and monitors your servers, applications, services & SNMP devices while additionally providing alerts and reports concerning the performance of your assets.

NetVision automatically discovers every host in your entire network (including neighbor networks behind the router), then scan for services running on them. Hosts are presented on interactive maps that display all critical information (leading service response time, services & host down time, non-responding services, alerts etc.), so you can quickly spot problems.

Using either TCP/IP, SNMP or Windows Management Instrumentation (WMI), the program can identify and monitor:
- Systems: Windows, Linux, Unix servers; routers, switches, VoIP, and firewalls
- TCP/IP services (HTTP, POP3, SMTP, FTP and 50 other).
- Performance counters - Windows and SNMP - like CPU utilization, memory, disk space, network transfers, etc.
- Applications: monitor the health of applications such as: MS SQL, MS Exchange, MS IIS, Windows system and many more.
- Web site: page load time; you can also set up alerting when a page changes content.
- Mail server: NetVision not only checks to see whether mail server responds to a simple request. It also performs real test operations like sending and receiving e-mail.

You can set up multiple alerts to monitor the status of your systems and receive an alarm whenever they go down or experience problems, like mail server problem, MS SQL Server parameters out of range, etc. Available notifications & actions: e-mail & ICQ message, desktop notification, sound, text-to-speech, running external programs, writing to file.

NetVision provides very clear, real-time, and historical charts of all monitored parameters (services and counters). Such charts can be presented over the desired time range selected right in the program.
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