smali
https://github.com/JesusFreke/smali
smali/baksmali is an assembler/disassembler for the dex format used by dalvik, Android's Java VM implementation. The syntax is loosely based on Jasmin's/dedexer's syntax, and supports the full functionality of the dex format (annotations, debug info, line info, etc.)
Downloads are at https://bitbucket.org/JesusFreke/smali/downloads/. If you are interested in submitting a patch, feel free to send me a pull request here.
See the wiki for more info/news/release notes/etc.
github Issue tracker - For any bugs/issues/feature requests
#smali on freenode - Free free to drop by and ask a question. Don't expect an instant response, but if you hang around someone will respond.
Some useful links for getting started with smali
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