PoshConsole is a modern PowerShell Console. The PoshConsole is written in WPF and including a custom ConsoleTextBox control which could be reused for other purposes.PowerShell Console will also include lots of powerful features like tab-completion and keyboard navigation.It has separate options for setting the window’s opacity, always on top ,show in taskbar and has fully configurable colors.

Download PoshConsole

The first addin allows you manipulate Nant targets and tasks  within VS 2005

NAntAddin Features:

• Read .nant and .build files
• Build visual tree from NAnt files
• Filter public/private targets
• Display target/task properties
• Locate selected node into build file
• Start/Stop selected target
• At solution startup reload default build file
• Full integration with VisualStudio
• Sources provided

Download NAntAddin

The second addin allows you run NUnit tests without leaving VS IDE

Download NUnitAddin

[Via Nauman Leghari's Blog]