ConfuserEx supports .NET Framework from 2.0 - 4.5 and Mono (and other .NET platforms if enough request!). It supports most of the protections you’ll find in commerical protectors, and some more!

With IP*Works! SSH, developers can rapidly build SSH secured applications including secure file transfer, secure remote login, secure email, and more. SSH is a low-level communications protocol providing security via strong encryption and advanced cryptography.

Best selling POP3/SMTP email .NET component for C#, VB.NET, and ASP.NET. Best selling Zip .NET component for C#, VB.NET, and ASP.NET. HTTP client component for communicating with HTTP servers.

Products
POP3 / SMTP - Feature List
Zip, GZip, Bz2, .Z Compression - Feature List
Data Compression - Feature List
TAR Archive - Feature List
FTP2 - Feature List
IMAP - Feature List
Encryption - Feature List
RSA Encryption and Signatures - Feature List
DSA (DSS) Signatures - Feature List
Diffie-Hellman (DH) Key Exchange - Feature List
HTTP - Feature List
Socket / SSL - Feature List
SSH / SFTP - Feature List
MIME + S/MIME - Feature List
MHT - Feature List
HTML-to-XML Conversion - Feature List
Charset Encoding Conversion - Feature List
Email Bounce Processing - Feature List
XMP - Feature List

YuPdf is a PDF document creation library for Delphi (Embarcadero, CodeGear, Borland versions). It includes the following functionality:

Create PDF documents containing text, graphics, and bitmap images.
Easily add outlines, annotations, and document attachments.
Embed JPEG and PNG images, preserving transparency.
Embed Type 1 and TrueType fonts.
Document and image compression and encryption.
Character set and encoding support (1- and 2-byte UTF-8, ISO 8859-2 to 8859-16, Windows 1250 to 1258, KOI8-R).
CJK fonts and encodings for Chinese and Japanese text.
Object wrapper classes for simplified coding.
Extensive number of demo projects to get started.
No dependencies, does not require DLLs or external files.

CryptoLicensing For .Net supports all versions of the .Net framework from v1.0 to v4.0 and Visual Studio 2002 to Visual Studio 2010. It also supports the .Net Compact Framework, .Net Micro Framework, Silverlight and XNA. It can protect assemblies created with any .Net language including C#, VB.Net, Managed C++, J#, etc.The new version features new protections like external and internal method call hiding, improvements and optimizations to existing protections like string encryption, Anti-Reflector and Anti-Reflection, .Net Micro Framework, improved support for x64 assemblies, LINQ, XNA and WCF projects, support for satellite assemblies. The new version also fixes miscellaneous bugs in obfuscation logic and has improved obfuscation speed.

Crypto Obfuscator supports all versions of the .Net framework from v1.0 to v4.0 and Visual Studio 2002 to Visual Studio 2015. It also supports the .Net Compact Framework, .Net Micro Framework, Silverlight and XNA. It can protect assemblies created with any .Net language including C#, VB.Net, Managed C++, J#, etc.The new version features new protections like external and internal method call hiding, improvements and optimizations to existing protections like string encryption, Anti-Reflector and Anti-Reflection, .Net Micro Framework, improved support for x64 assemblies, LINQ, XNA and WCF projects, support for satellite assemblies. The new version also fixes miscellaneous bugs in obfuscation logic and has improved obfuscation speed.

.NET Reactor is a powerful code protection and software licensing system for software written for the .NET Framework, and supports all languages that generate .NET assemblies. Its' main features are :

Intellectual property protection
NecroBit Protection
Native Code generation
Obfuscation
Control Flow Obfuscation
String Encryption
Anti Tampering
Resource Encryption and Compression

Private exe Protector (PEP) is a professional software copy protection and license management. PEP works with traditional methods, such as file compression, code fragment encryption, metamorphic loading, protection from debugging and file tampering, and features new innovative techniques like data protection with stolen resources technique. All in one, it is the ideal solution for software developers.

Crypto Obfuscator supports all versions of the .Net framework from v1.0 to v4.0 and Visual Studio 2002 to Visual Studio 2015. It also supports the .Net Compact Framework, .Net Micro Framework, Silverlight and XNA. It can protect assemblies created with any .Net language including C#, VB.Net, Managed C++, J#, etc.The new version features new protections like external and internal method call hiding, improvements and optimizations to existing protections like string encryption, Anti-Reflector and Anti-Reflection, .Net Micro Framework, improved support for x64 assemblies, LINQ, XNA and WCF projects, support for satellite assemblies. The new version also fixes miscellaneous bugs in obfuscation logic and has improved obfuscation speed.