https://bytecodeviewer.com/ 

* Easy to use yet extremely effective. 

* Written to run on Java 7, supports Java 8. 

* Compile Decompiled Java classes with Ranino Compiler. 

* Quickly decompile classes using JD-Core. 

* Easily edit APKs via Smali/Baksmali integration. 

* Java Decompiling with Six different decompilers (DJ-GUI/Core, Procyon, CFR, Fernflower, Krakatau, and JADX-Core). 

* Bytecode Decompiling with CFIDE. 

* Android APK integrated with Dex2Jar. 

* Securely launch Java applications and insert hooks via EZ-Injection. 

* Scan for malicious code with the Malicious Code Scanner plugin. 

* Export as DEX, Jar, Class, Zip or Java Source File. 

* Open Android APKs, Android DEX, Java Class Files and Java Jars. (WAR & JSP Support!) 

* Extensively configurable, over 100+ settings! * Works seamlessly with all Operating Systems. 

* Integrate BCV into Windows by installing it, it'll associate all .class, .dex and .apk to open with BCV. 

* View Jar & APK Resources with ease by APKTool.jar integration. 

* 100% free and open sourced under GPL v3 CopyLeft.