Alert you once only when normal <-> abnormal status changed. No keep sending you alerts when it remains abnormal
 
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Ping_Alert WhatsApp/Email/Sound or SMS/Email/Sound alert only when PING consecutive loss and back to normal. Let you know when it is down and when it is back. Able to setup different host alert to different people  client Supernet360.
Port_Alert WhatsApp/Email/Sound or SMS/Email/Sound alert when TCP ports connection get consecutive timeout/loss and restored. Monitoring TCP ports are monitoring your  MYSQL/MSSQL/ORACLE/FTP/HTTPD/... TCP applications remotely. Article on ghacks.net for the Port_Alert software.
CPU_Alert WhatsApp/Email/Sound or SMS/Email/Sound alert when CPU/MEMORY usage get continuous higher or lower than threshold and restored. Alert email includes TOP1 program name, usage and SNAPSHOT of processes list with usage sorted. CPU/MEM Overloading alert you, long-time Not working alert you too.  
SMSCMD Windows / Linux command line send SMS directly. No installation required. smscmd "sms text" "phone1,phone2". Password file can be encrypted and put in local. Easy to be called by any types of program or put into Windows Scheduler/Linux cron table.
MailCMD Windows command to send mail and attachment. No installation required and SSL supported. Response back with "Mail sent successfully with return code 0" or "Mail sent failure" for your program to take action. Also response back the attached file name and file size if there is an attachment.