Dataloop.io is described as 'Effortless monitoring for your online service'. There are more than 50 alternatives to Dataloop.io, not only websites but also apps for a variety of platforms, including Linux, Windows, Mac and Android. The best alternative is Zabbix, which is both free and Open Source. Other great sites and apps similar to Dataloop.io are Nagios (Freemium, Open Source), Datadog (Paid), Spiceworks Help Desk (Free) and Icinga (Freemium, Open Source).
Monit is a free open source utility for managing and monitoring, processes, programs, files, directories and filesystems on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.
Observium is an autodiscovering PHP/MySQL/SNMP based network monitoring which includes support for a wide range of network hardware and operating systems including Cisco, Linux, FreeBSD, Juniper, Brocade, Foundry, HP and many more.
NetCrunch is an all-in-one and agentless network, server, application, log, file and web monitoring suite, capable of monitoring more than 1 million elements at once. It runs on Windows Server and only needs 4GB of RAM and 4 cores.
Monitor servers, network devices and websites via one modern SaaS solution. Instant push alerts, pre-configured for a fast & easy setup, highly affordable pricing, MSP functionality. Monitors cpu, disks, memory, processes and availability.
Shinken is an open source computer system and network monitoring software application compatible with Nagios. It's written in Python and therefore is able to run on all platforms where a Python interpreter is available.
Server monitoring software for physical, virtual, and cloud-based IT. They also do email monitoring, application monitoring. The system is used to provide insight into server up-time and reduce outages.