ASN.1 to C/C++/C#/JAVA 
ASN.1 Products
ASN1C ASN.1 Compiler
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An ASN.1 to C, C++, Java, or C# code generation tool that supports
all major encoding rule types (BER, DER, CER, PER, and XER).
ASN1VE ASN.1 Viewer/Editor
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ASN.1 viewer/editor graphical user interface (GUI) tool for
analyzing ASN.1 encoded data.
ASN2TXT ASN.1 to Text Translator
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ASN2TXT is a command-line tool for translating ASN.1 binary encoded data to
various textual formats including XML and comma-separated-value (CSV).
This tool has replaced the ASN2XML and ASN2CSV tools.
XML Solutions
XBinder XML Schema Compiler
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An XML data binding tool for generating C/C++, Java*, or C# data structures and
encoders/decoders from XML schema specifications.
Telephony Solutions
Telephony APIs
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Telephony Application Programming Interfaces (API's) are
pre-compiled and optimized C/C++ function libraries, Java*
class libraries (.jar files), or .NET DLL's tailored to a specific ASN.1
application.
Objective Open H.323 (ooH323c) >>>
ooH323c is a simple open source H.323 protocol stack. An Asterisk channel driver is also available.
CSTA All-phases .NET DLL >>>
The CSTA all-phases .NET DLL is a Microsoft .NET component that can be used to communicate with a wide variety of PBX devices that support CSTA.
Free Web Tools
3G NAS online decoder (3GPP TS 24.007/TS 24.008): 
3G NAS Decoder
Translate ASN.1 BER/DER/PER Encoded Data to XML:
Translate an ASN.1 Schema to XML Schema (XSD):
ASN2XSD >>>
