Here is a list of my favourite development tools:

TeamCity http://www.jetbrains.com/teamcity/

<ul>Configuration Management</ul>
Puppet https://puppetlabs.com/puppet/puppet-enterprise
ESCAPE - Centralised restful configuration service (open source)

<ul>Scripting Technologies</ul>
Gradl
Buildr

<ul>Build Tools</ul>
Ivy
Maven

<ul>Production monitoring system</ul>
(which version deployed to which environment). 
For example, Nagios, OpenNMS and HP Open View.

<ul>Databases</ul>
MongoDB - http://www.mongodb.org/

<ul>Mobile Development</ul>
Sencha Touch - http://www.sencha.com/

<ul>Testing Tools</ul>
High Level Tools
Selenium
Fitnesse
?Rally (Agile Test Management Software)

<ul>Refactoring</ul>
Resharper

SoapUI (Useful for creating mock data services)

<ul>Tools</ul>
Beyond Compare - http://www.scootersoftware.com/index.php
http://www.xmlvalidation.com/
Glimpse http://getglimpse.com/
VMX Virtual Server Management - http://www.trilead.com/Download/
WIX - http://wixtoolset.org/

Fiddler (HTTP debugging proxy)

Paint.NET (Graphic Editor)

Notepad++ (Text Editor)

JSON extension for Notepad++ 
 
Subversion (Version Management)
TortoiseSVN (Subversion Interface)
Pixel Ruler


<ul>UI Software</ul>
Balsamiq - Wireframing Software
Crazy Egg Confetti - Eye Tracking Software
Color Schemer

<ul>Charting libraries</ul>
AngularJS
Telerik Kendo UI
.netCharting
aCharts
Cubism.js
D3
Dojo GFX
dygraphs
Flot
Flotr
Flotr2
Google Chart Tools
gRaphaël
Highcharts
Envision.js
Javascript InfoVis Toolkit
jqPlot
jQuery Sparklines
jQuery Visualize
milkchart
RGraph
Rickshaw
Timeplot
GraphUp

