Add Healthchecks.

README.md

@@ -71,7 +71,7 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
 * [Burp](http://burp.grke.org/) - Network backup and restore program.
 * [Duplicity](http://duplicity.nongnu.org/) - Encrypted bandwidth-efficient backup using the rsync algorithm.
 * [Fileprune](http://www.spinellis.gr/sw/unix/fileprune/) - delete archived backup files with diverse constraints.
-* [FreeFileSync](http://sourceforge.net/projects/freefilesync/) - Folder comparison and synchronization tool providing highly optimized performance and usability without a needlessly complex user interface. 
+* [FreeFileSync](http://sourceforge.net/projects/freefilesync/) - Folder comparison and synchronization tool providing highly optimized performance and usability without a needlessly complex user interface.
 * [Lsyncd](https://github.com/axkibe/lsyncd) - Watches a local directory trees for changes, and then spawns a process to synchronize the changes. Uses rsync by default.
 * [Rsnapshot](http://www.rsnapshot.org/) - Filesystem Snapshotting Utility.
 * [SafeKeep](http://safekeep.sourceforge.net/) - Centralized pull-based backup using `rdiff-backup`.
@@ -100,7 +100,7 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
 * [Openshift Origin](https://openshift.github,io) - Open source upstream of OpenShift, the next generation application hosting platform developed by Red Hat.
 * [OpenStack](https://www.openstack.org/) - Open source software for building private and public clouds.
 * [The Foreman](http://theforeman.org/) - Foreman is a complete lifecycle management tool for physical and virtual servers. FOSS.
-* [Cobbler](http://www.cobblerd.org/) - Cobbler is a Linux installation server that allows for rapid setup of network installation environments. 
+* [Cobbler](http://www.cobblerd.org/) - Cobbler is a Linux installation server that allows for rapid setup of network installation environments.
 * [Mesos](http://mesos.apache.org/) - Develop and run resource-efficient distributed systems.
 * [Tsuru](http://www.tsuru.io/) - Tsuru is an extensible and open source Platform as a Service software.
 
@@ -121,7 +121,7 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
 * [Consul](http://www.consul.io/) - Consul is a tool for service discovery, monitoring and configuration.
 * [Doozerd](https://github.com/ha/doozerd) - Doozer is a highly-available, completely consistent store for small amounts of extremely important data.
 * [etcd](https://github.com/coreos/etcd) - A highly-available key value store for shared configuration and service discovery
-* [Serf](http://www.serfdom.io/) - Serf is a tool for cluster membership 
+* [Serf](http://www.serfdom.io/) - Serf is a tool for cluster membership
 * [ZooKeeper](http://zookeeper.apache.org/) - ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services.
 
 ## Cloud Storage
@@ -200,7 +200,7 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
 *DHCP tools.*
 
 * [lsleases](https://github.com/j-keck/lsleases) - dhcp leases sniffer.
-    
+
 ## DNS
 *DNS servers.*
 
@@ -286,13 +286,14 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
 ## Monitoring
 *Monitoring software.*
 
-* [Alerta](https://github.com/guardian/alerta) - Distributed, scaleable and flexible monitoring system 
+* [Alerta](https://github.com/guardian/alerta) - Distributed, scaleable and flexible monitoring system
 * [Cacti](http://www.cacti.net) - Web-based network monitoring and graphing tool.
 * [Cabot](http://cabotapp.com/) - Monitoring and alerts, similar to PagerDuty.
 * [Centreon](http://www.centreon.com) - IT infrastructure and application monitoring for service performance.
 * [check_mk](http://mathias-kettner.com/check_mk.html) - Collection of extensions for Nagios.
 * [Dash](https://github.com/afaqurk/linux-dash) - A low-overhead monitoring web dashboard for a GNU/Linux machine.
 * [Flapjack](http://flapjack.io/) - Monitoring notification routing & event processing system
+* [Healthchecks](https://github.com/healthchecks/healthchecks/) - Cron job monitoring.
 * [Icinga](https://www.icinga.org/) - Fork of Nagios.
 * [LibreNMS](https://github.com/librenms/librenms/) - fork of Observium.
 * [Monit](http://mmonit.com/monit/#home) - Small Open Source utility for managing and monitoring Unix systems.
@@ -522,7 +523,7 @@ Comparison of NoSQL servers: http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-v
 
 * [ChiliProject](https://www.chiliproject.org) - Fork of Redmine.
 * [GitBucket](https://github.com/takezoe/gitbucket) Clone of GitHub written in Scala; single jar install.
-* [GitLab](https://www.gitlab.com/) - Clone of GitHub written in Ruby. 
+* [GitLab](https://www.gitlab.com/) - Clone of GitHub written in Ruby.
 * [Gogs](http://gogs.io/) - Written in Go.
 * [OpenProject](https://www.openproject.org) - Project collaboration with open source.
 * [Phabricator](http://phabricator.org/) Written in PHP.
@@ -565,7 +566,7 @@ Comparison of NoSQL servers: http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-v
 * [sshuttle](https://github.com/apenwarr/sshuttle) - Poor man's VPN.
 * [strongSwan](http://www.strongswan.org/) - Complete IPsec implementation for Linux.
 * [tinc](http://www.tinc-vpn.org/) - Distributed p2p VPN.
-* [SigmaVPN](http://frozenriver.net/SigmaVPN) - SigmaVPN is simple, light-weight and modular VPN software for UNIX systems, deploying the NaCl encryption library. 
+* [SigmaVPN](http://frozenriver.net/SigmaVPN) - SigmaVPN is simple, light-weight and modular VPN software for UNIX systems, deploying the NaCl encryption library.
 
 ## XMPP
 *XMPP servers.*