PilotEdit - PilotEdit Lite is an advanced text and hex editor that supports opening of files larger than 4GB.
Decompiler.com - Online Java and Android decompiler. Just drag and drop .JAR or .APK file and browse decompiled content online.
IDA - The best-of-breed binary code analysis tool, an indispensable item in the toolbox of world-class software analysts, reverse engineers, malware analyst and cybersecurity professionals.
dnSpy - .NET assembly editor, decompiler, and debugger
HextEdit - HextEdit is a proficient hex editor and disassembler for Mac.
ILSpy - ICSharpCode. Decompiler. Console..