ArgoUML
Open source UML modeling tool written in Java
Papyrus
Open source model-based engineering tool based on UML and SysML
ARCAD
DevOps, testing and modernization tools for IBM i applications
Checkmarx
Application security testing platform (SAST, SCA, DAST, IaC, API)
Clang Static Analyzer
Source code analysis tool for C, C++ and Objective-C, part of Clang
W3C Link Checker
Online checker for links and anchors in web pages