Looking for open source linux / android stress testing software.

Looking for open source linux / android stress testing software. Specifically to test storage / ram / cpu / gpu etc. Same goes for android but to also include tests for the screen / speakers / sensors etc. Coming from windows I would use OCCT / prime95 / memtest86+ / 3D mark / valley benchmark, h2testw. So I am looking for open source alternatives, preferably with a gui, for both linux and android. This is with an aim to just stress testing components for several hours to make sure the system as a whole is stable and working well. For new / second hand systems and for fault location troubleshooting. Thank you.