The best open source alternative to Hard Disk Sentinel is CrystalDiskInfo, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 25 alternatives to Hard Disk Sentinel, but unfortunately only two of them is open source.
CrystalDiskInfo is a HDD/SSD utility software which supports S.M.A.R.T. It shows the health status much more clearly than similar tools. The "Function / Graph" is especially interesting for the "Reallocated Sectors Count".
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CrystalDiskInfo vs Hard Disk Sentinel opinions
Some users think CrystalDiskInfo is a great alternative to Hard Disk Sentinel, some don't.
headphoneamp CrystalDiskInfo does not support hard drive surface tests like reads, writes and combined
The smartmontools package contains two utility programs (smartctl and smartd) to control and monitor storage systems using the Self-Monitoring, Analysis and Reporting Technology System (SMART) built into most modern ATA and SCSI harddisks.
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Most users think smartmontools is a great alternative to Hard Disk Sentinel.