GUI application for inspecting PCIe configuration of one's device, uses custom Linux kernel module to pull data from the kernel itself. Executable ('xplorer') needs to be run with root privilages to ensure everything can work properly. Alternativelly, just type 'PCIe(xplorer)' into application menu.
man xplorer
TraceNVMe
TUI application for tracing raw NVMe subsytem events. It uses NVMe driver kernel hooks exposed to the user by TraceFS to pretty-print everything done by the whole subsystem. It has negligible performance impact.
man tnvme
Currently only available for Linux Debian-based distros through instalation package of <1MB