- 
The SimpleLanguage, an example of using Truffle with great JavaDocs https://github.com/graalvm/simplelanguage 
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Series of blog posts on implementing a Lisp http://cesquivias.github.io/ 
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Truffle Tutorials and Presentations https://wiki.openjdk.java.net/display/Graal/Publications+and+Presentations 
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Truffle FAQ and Guidelines https://wiki.openjdk.java.net/display/Graal/Truffle+FAQ+and+Guidelines 
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Graal VM and Graal.JS on the Oracle Technology Network http://www.oracle.com/technetwork/oracle-labs/program-languages/overview/index-2301583.html 
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Papers on Truffle http://ssw.jku.at/Research/Projects/JVM/Truffle.html 
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Papers on Graal http://ssw.jku.at/Research/Projects/JVM/Graal.html 
Maintained
- FastR, an R implementation: https://bitbucket.org/allr/fastr
- JRuby+Truffle: https://github.com/jruby/jruby/wiki/Truffle
- SOM Smalltalk: https://github.com/SOM-st/TruffleSOM
- SOMns, a Newspeak: https://github.com/smarr/SOMns
- SimpleLanguage: https://github.com/graalvm/simplelanguage
- Graal.JS, a JavaScript implementation: http://www.oracle.com/technetwork/oracle-labs/program-languages/overview/index-2301583.html
- TruffleC, a C on top of the JVM: http://dl.acm.org/citation.cfm?id=2647528
Status Unknown:
- ZipPy, a Python 3: https://bitbucket.org/ssllab/zippy
Experiments
- 
Mumbler: A Lisp https://github.com/cesquivias/mumbler & http://cesquivias.github.io/ 
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Lua https://github.com/lucasallan/LuaTruffle & http://www.luatruffle.org/ 
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Hex https://bitbucket.org/hexafraction/truffles & https://hextruffle.wordpress.com/ 
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Golo (a minimal Truffle backend) https://github.com/smarr/golo-lang/tree/truffle 
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TruffleMATE, a Smalltalk with a completely reified runtime system https://github.com/charig/TruffleMATE 
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The Truffle paper: “Self-Optimizing AST Interpreters” http://lafo.ssw.uni-linz.ac.at/papers/2012_DLS_SelfOptimizingASTInterpreters.pdf 
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How to represent Objects Efficiently: “An Object Storage Model for the Truffle Language Implementation Framework” http://chrisseaton.com/rubytruffle/pppj14-om/pppj14-om.pdf 
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The Truffle+Graal paper: "One VM to Rule Them All" http://lafo.ssw.uni-linz.ac.at/papers/2013_Onward_OneVMToRuleThemAll.pdf 
GraalSqueak should be in Maintained, maybe with the
gu install -u https://www.hpi.uni-potsdam.de/hirschfeld/artefacts/graalsqueak/graalsqueak-component-0.6.jarcommand as note