Following list of tools are most useful in my day to day life for all types of customizations in Dynamics CRM 2011. Hope you find useful.
1. WebResources Manager for Microsoft Dynamics CRM 2011
https://webresourcemanager.codeplex.com/
2. CRM 2011 Visual Ribbon Editor
https://crmvisualribbonedit.codeplex.com/
3. CRM 2011 OData Query Designer
https://crm2011odatatool.codeplex.com/
4. Toolbox for Dynamics CRM 2011
https://xrmtoolbox.codeplex.com/
5. Ribbon Workbench for Dynamics CRM 2011
http://www.develop1.net/public/page/Ribbon-Workbench-for-Dynamics-CRM-2011.aspx
6. SiteMap Editor for Microsoft Dynamics CRM 2011
Microsoft Dynamics CRM Blog 