I built javadecompiler.org, a small hub for a set of open-source Java bytecode decompilation tools and libraries. The main goal is to make it easier to work with multiple Java decompilers through one consistent interface.
Transformer API — a common API for integrating multiple decompilers, with in-memory decompilation support and a .class loader utility. It currently supports Fernflower, Vineflower, Procyon, CFR, JD-Core v0/v1, and JADX.
JD-GUI-DUO — an unofficial successor to JD-GUI. It is a 2-in-1 decompiler UI based on JD-Core v0 and v1, with support for third-party decompilers, output comparison, and recompilation.
ECD++ — a fork of the Enhanced Class Decompiler plugin for debugging class files without source code, also integrated into the same decompiler ecosystem.