Go to github.com/vlm/asn1c for the latest version.
This ASN.1 compiler turns ASN.1 specifications into C code. The asn1c is shipped together with conformant BER/DER/XER/PER codecs. The X.509, GSM TAP3, MEGACO, RRC and LDAP encoding and decoding examples are part of the source code distribution.
NOTE: THE asn1c PROJECT HAS LARGELY MOVED TO GITHUB: http://github.com/vlm/asn1c
Python modules that wrap Lev Walkin's asn1c code.
ASN.1 notation is translated to C-code and this code is built into python module that can der-encode and -decode structures from ASN.1 description.
LTE ASN.1 Message Editor (lameditor) is a open source tool for editing long term evolution (LTE) RRC messages. It can be used as a start for commercial applications and ideal for test purposes.