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Can anyone recommend a good (preferably free) application or service to monitor the uptime of a server? And possibly send out an alert by email or sms when it goes down? Statistics are not really needed, it's just about knowing when a server goes down.

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It depends how "sophisticated" tool you'd like to have (and install of course). You can use simple cron script on another server, or software designed for server monitoring. I've got experience and I can recommend you Zabbix or Nagios, but you can choose another one.

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Try this GAEAPIMonitor http://www.honcheng.com/2010/12/GAEAPIMonitor---Open-source-API-monitoring-tool-on-Google-AppEngine

It is open source, written in python for AppEngine, so you can just run it on your own AppEngine account. Alerts you with a Twitter DMs when server is down, content has changed or has not changed, if an API is returning an invalid JSON if it is supposed to return JSON.

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These are a few monitoring tools that you can try out

Free solutions

1. System commands: Nothing beats default commands like top, vmstat, iostat, netstat etc when it comes to knowing the health of a system
2. SeaLion: It is a cloudbased monitoring solution. What it does is basically execute all default system profiling commands (like top, vmstat etc) and present it in a very intuitive timeline format. It installation procedure is one of the easiest I have come across
3. Nagios: Though very complicate to use and configure, it is very robust and most deployed solution available
4. Cacti
5. Zabbix

Paid solutions

1. New Relic
2. Server density
3. Copper Egg