Alvas.CDBurn 

Alvas.CDBurn for .Net is a collection of 100% native CLR compliant controls written in C#. Collection allows C# and VB.Net developers to create applications that record files to the writable CD (CD-R and CD-RW).
c# vb.net components

db4o for .NET 

db4o (database for objects) is the open source object database. Features include native .NET object persistence, object-oriented replication, automatic schema recognition, 350K footprint. Ideal for embedded use and in realtime systems.
db4o database objects object oo .net dotnet c# csharp mono cli free opensource

Alvas.FileControls 

Collection allows C# and VB.Net developers to operate with files without writing code. Enough to place ExplorerTreeView and ExplorerListView on the form to get the possibilities of Windows Explorer in your applications...
c# vb.net components

MessageBoxGo 

MessageBox control for .NET. This freeware control allows for convenient fitting your applications with message boxes.
freeware message box source .net c# vb j#

CryptoText 

The CryptoText encryption library contains COM and .NET components for cross-platform Microsoft Windows text and file encryption on Pocket PC and Desktop, including components for dotNet, .NET CF, COM / ActiveX, PocketPC.
password encryption encrypt com component protection crypto cryptoapi evb evc ce pocketpc .net dotnet

CLR Script 

Automate common Windows tasks. Using a C-like language, powerful script programs can be written.
script macro automation batch launcher keyboard start run control