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http://20bits.com/article/statistical-analysis-and-ab-testing
A good introduction to the statistics math of split testing.
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http://abtester.com/calculator/
Includes the math behind the calculation, and sample PHP code to actually generate the numbers. Very cool.
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http://alertfox.com/
Monitoring with a focus on browser experience. Plans are €10/month for simple, $50/month for 1 browser, $100/month upwards for the full service.
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http://api.orange.com/en/api/sms-api/cost
Orange provide an SMS API using shared shortcodes / international UK number. Not sure what pricing is, complicated, but they are listed. Probably not a first choice.
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http://blitz.io/
Performance testing, monitoring, and some kind of fix-it service, mostly in private beta. Flashy, funky, cool, style design and chat with limited technical details.
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http://blog.asmartbear.com/easy-statistics-for-adwords-ab-testing-and-hamsters.html
Simple formula to calculate statistical significance at 95% on AB / split tests. N = total clicks, D = diff between win & lose, if D² > N, it's statistically significant. Example, 14 clicks A, 22 clicks B, N=36, D=22-14=8, 8²=64>36, win. If 2D²>N, 99%.
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http://blog.cfelde.com/2011/05/performance-rackspace-cloud-vs-amazon-web-services/
Interesting article comparing Rackspace and AWS performance when applying high frequency trading strategies against 10 years of archive data. Rackspace io kicks ass, CPU slightly ahead.
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http://blog.tonycode.com/tech-stuff/http-notes/making-http-requests-via-telnet
A helpful article on how to make HTTP requests by hand via telnet. Doesn't work by hand for me, only the script approach works. But useful nonetheless.
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http://bulksms.vsms.net/w/pricing.htm
Pricing for BulkSms, an SMS gateway also used by pingdom.com. Charges 3 rates for delivery quality. Uncertain of whether they offer incoming numbers.
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http://cacti.net/
A web based tool to produce graphs based on data stored in RRDTool, usually used as a front end for data collected through systems like nagios.
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http://code.google.com/p/pygooglevoice/
A python wrapper for the Google Voice API. Potentially allows the sending of SMS messages (or receipt of SMS messages) via Google Voice for free in the US and at GV costs overseas.
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http://copperegg.com/
Yet another monitoring app. Copper Egg combines real user monitoring, generic metric logging, server monitoring and maybe other stuff(?) into one application. Pricing starts at $19/month. Not unreasonable.
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http://developer.yahoo.com/performance/rules.html
YSlow rules for optimising web performance from the Yahoo Developer Network. 34 rules that make sites faster. Very useful reading.
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http://download.fedora.redhat.com/pub/epel/5/x86_64/repoview/
Web based access to the EPEL5 repo (as installed on rack). Useful to search for packages.
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http://engineering.gomiso.com/2011/01/04/easy-monitoring-of-varnish-with-munin/
Very useful walkthrough on setting up munin to monitor Varnish. Explains how to install and configure munin, which is very simple and very valuable.
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http://info.iet.unipi.it/~luigi/dummynet/
Dummnet simulates different network bandwidth rates and latencies by introducing delays or chokes, works on *nix flavours.
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http://it.toolbox.com/blogs/securitymonkey/howto-securing-a-website-with-client-ssl-certificates-11500
A wonderful article on how to setup Client SSL authentication. Includes all the openssl commands and apache config variables.
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http://just-dnslookup.com/
Check DNS resolution speeds from various places around the world, very useful.
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http://kly.no/posts/2009_12_08__Varnishstat_for_dummies__.html
Great little article on how to make sense of the varnishstat output.
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http://leesbian.net/updating-magento-13x-to-php-53-compatibility
A short list of code changes required to make earlier Magento versions PHP 5.3 compatible. Very useful. Untested.
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http://magebenchmark.sonassi.com/
A site that apparently compares the "speed" of magento hosting providers. Dubious without further research.
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http://mixpanel.com/
Web action analytics. Tracks events rather than pageviews, so users clicking "Like", etc. All data in real time, detailed analysis, retained >3yrs. Pricing is free up to 25k data points, $150 for 500k, and upwards. Interesting.
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http://mobitest.akamai.com/
Mobile performance testing platform from akamai based on the webpagetest.org infrastructure, free. Useful.
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http://newrelic.com/
A system to monitor multiple aspects of a live application in production including the page load times, server load times, mysql response times, javascript render times, and so on. Expensive.
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http://runslikeclockwork.com/
Very simple web monitoring system that checks if a site is online and sends alerts by SMS If down. They also offer a free monit aggregation service. Plans start £3/month basic, £5/month for 5 sites every 30 seconds plus 15 sms credits / month.
