Free, open-source ..
Download SharpZipLib 0.5 (from .NET)

download sharpziplib, .net freeware
1.2 MB | For Windows 7 / Vista / XP / NT | Free

XYGraph is a native ..
Download XYGraph 2.20 (from .NET)

xygraph
0.38 MB | For Windows 7, Windows 8 / Vista / XP / NT | Free

Revjon's FreeTextBox control provides programmers with a user interface element for a WYSIWYG HTML editing environment similar to what is available in word processors. A review of FreeTextBox has also been published.
Download FreeTextBox 1.6.3 (from .NET)

freetextbox
1 MB | For Windows 7 / Vista / XP / NT | Free

PureComponents NicePanel is container component of active look, which will enrich your applications..
Download PureComponents NicePanel for .NET 1.0 (from .NET)

nicepanel, .net freeware
13.03 MB | For Windows 7, Windows 8 / Vista / XP / NT | Free

Microsoft's ..
Download FTP Component 1.0 (from .NET)

843 KB | For Windows 7 / Vista / XP / 2000 / ME | Free

SMTPClient from Bossware lets developers add outgoing email capabilities to their Windows Forms and ASP..
Download CSpot SMTPClient 0.4 (from .NET)

862 KB | For Windows 7 / Vista / XP / NT | Free