Many old friends, e.g. Hiren’s and UBCD4Win, are no longer in development, and for a while there was no clear replacement. alternativeTo is covering it now:
alternativeto.net/software/hiren39s-bootcd/
and two are very interesting to this writer, both with mini10:
gbatemp.net/threads/medicat-dvd-a-multiboot-linux-dvd.361577/
For hard drives alone, we have another:
www.majorgeeks.com/files/details/all_in_one_–_system_rescue_toolkit.html
In the latter (its basis is 64-bit Ubuntu), open Disks, and find the hard drive test suite by clicking the round icon at the upper-right corner; it appears to have the same functionality as SeaTools, without the driver problems of the Seagate downloadables.