Bytecode Libraries
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A very small and fast Java bytecode manipulation framework
Last Release on May 8, 2021
The runtime bytecode manipulator in form of a java agent that implements some framework features by injecting code into tree classes.
Last Release on Apr 15, 2015
Scala based tool to manipulate JVM bytecode
Last Release on Jun 13, 2015
Different instrumentation frameworks
Last Release on Feb 3, 2017
Apache Commons Weaver Parent
Last Release on Sep 7, 2018
Classfilewriter
Last Release on Jan 26, 2011

Brennus provides a builder pattern and the logic to simplify generating bytecode. It uses ASM under the hood for bytecode generation.
Last Release on Jan 9, 2014
A prototype-library based on ASM 4 that computes definitions/uses of each instruction
Last Release on Mar 25, 2014
Jour bytecode instrumentation library.
Last Release on Dec 12, 2008
SwungWeave: Bytecode weaver tool
Last Release on Sep 10, 2015