1.

Conky/lua system monitor 0.99

System Monitoring by donbcilly
Simple conky system monitor with a lua graph for CPU. Lua Graph widget by wlourf - http://u-scripts.blogspot.com/2010/10/graph-widget.html Just put the graph.lua and grid2.png file in the same directory as your conkyrc (or edit PATHs accordingly). If you don't like the grid, just remove the file...
Rating: 5.0
May 27 2019
2.

StatusPilatus

System Monitoring by hb882
Monitor your PC like never before! NOTE: This is only to provide appimages, I am not the developer.
AppImage
Rating: 5.0
Nov 17 2018
3.

Hotspot

System Monitoring by hb882
The Linux perf GUI for performance analysis.
AppImage
Rating: 5.0
Nov 08 2018