One nice thing this discussion shows is there are definitely users who are well-informed enough to question the actual necessity of a 35-pass (deprecated) procedure.
Still, ref. to the Ascomp Secure Eraser landing page statement (which I would suggest to reword to be more useful):

"This easy-to-use Windows software will overwrite sensitive data even up to 35 times – regardless of whether they are files, folders, drives, recycle bin or traces of surfing. You can also delete files that have already been deleted, but this time for good.
Secure Eraser not only overwrites using random data, it offers the approved US Dod 5220.22-ME and U.S. DoD 5220.22-MECE standards from the US Department of Defense, the German industrial standard and the Peter Gutmann standard. All deletions are logged in details upon request."

A lot of people are quoting from this paper written some time ago
You need to look in the Recommendations section for any relevant info though
https://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html#recommendations

to summarize he recommends Eraser and DBAN

http://eraser.heidi.ie/

http://www.dban.org/

Shouldn't you clearly say that this software isn't to be used for SSDs?!

Hard drive wipers are given away as freeware. Just Google it.
In addition, many encryption software have extra feature that can wipe your hard drive.
Kryptel is one of them.

Out of 1,000 computer owners, how many of them "sell" their hard drives?
Many none.
Nowadays, new hard drives are very cheap.
They are probably physically destroyed and thrown.
How many people want to buy a "used" hard drive?
Maybe none.
You do not know what is inside. What malware. What problems. What bad sectors. What physical damage.
Why would you want to take the risk?
It is probably something that is 10 years old. And horribly outdated.
It is not free. You still have to pay to buy a use hard disk.
Then why not pay just 10% more (on top of the price of an obsolete and used hard drive) and but a NEW and latest high technology hard drive?

I was a bit sceptical about this offer and I am not so much interested in the functionality of this program, but the website of the maker; clean, all contactinfo available, no nonsense, convinced me. Installed it to see if the impression of the website was an indication of the GOTD. Program made an even better impression, clear, lots of options, small footprint. Program also settles itself in the rightclick menu in windows explorer which is handy with files but not so much when the target is a partition. When more than one people share a computer this could cause a risk. (I would like to see an option to disable the rightclick entry when on partitions, or to block deleting when the command is given from the rightclick menu). Very surprised that i liked the design of the program so much but I don´t need this program, however, if you need this kind of functionality, give it a try. Ascomp has some other programs "free for private purposes", and I will try some of them, including the one mentioned by MikeR.

Quote: "This easy-to-use Windows software will overwrite sensitive data even up to 35 times "

So sad to see software vendors, and Giveaway - continuing to hype the now-deprecated 35 overwrites.
The author of that 35 pass procedure has written to clarify that 35 passes was for old technology disks (pre 1995). It would be so much better if developers would be clear about overwriting data - and not try to make people think that 35 must be better...
Actual Peter Gutmann statement:
'Epilogue
In the time since this paper was published, some people have treated the 35-pass overwrite technique described in it more as a kind of voodoo incantation to banish evil spirits than the result of a technical analysis of drive encoding techniques. As a result, they advocate applying the voodoo to PRML and EPRML drives even though it will have no more effect than a simple scrubbing with random data. In fact performing the full 35-pass overwrite is pointless for any drive since it targets a blend of scenarios involving all types of (normally-used) encoding technology, which covers everything back to 30+-year-old MFM methods (if you don't understand that statement, re-read the paper). If you're using a drive which uses encoding technology X, you only need to perform the passes specific to X, and you never need to perform all 35 passes. For any modern PRML/EPRML drive, a few passes of random scrubbing is the best you can do. As the paper says, "A good scrubbing with random data will do about as well as can be expected". This was true in 1996, and is still true now.'

A widely respected German developer, Ascomp seems of late to have been re-jigging its product portfolio with new versions while providing greater clarity as to what's free and what's not. This has been especially notable in its excellent Synchredible the only back-up app I ever recommend to friends and family on the grounds of simplicity, speed and effectiveness:

https://www.ascomp.de/en/products/show/product/synchredible/tab/details

and whose only drawback used to be a nag screen of irritatingly intrusive frequency urging users to pay for a commercial license.

Recently, however, Ascomp seems to have had a change of heart. The nagging is non-disruptive and infrequent. In fact: the developer makes it plain that if its software is being used by a home user, then that's fine: no charge. Which, therefore, brings us to today's giveaway, because yes, Secure Eraser is free to home users:

https://www.ascomp.de/en/shop/show/group/10

there being not a jot of difference in practice between Secure Eraser Standard and Secure Eraser Professional apart from the occasional, and now low-key, nag.

On which basis then, today's giveaway isn't hobbled by the spectre of a re-install cost; if you take advantage of the offer, but then subsequently 'lose' this Pro version, simply download the free, Standard version -- because whether as freeware or commercialware, Ascomp's track record has long been pretty darn good. As to whether this eraser is better than every other eraser out there, that's down to you to decide.

About the only comment I'd make is that I'm very surprised and not a little baffled to see Ascomp referencing Peter Gutmann as a type of 'standard' when really, Ascomp should know much better. Peter himself made it clear more than 10 years ago that the 35-pass erasure technique is a complete waste of time and effort quote:

Epilogue: In the time since this paper was published, some people have treated the 35-pass overwrite technique described in it more as a kind of voodoo incantation to banish evil spirits than the result of a technical analysis of drive encoding techniques.

As a result, they advocate applying the voodoo to PRML and EPRML drives even though it will have no more effect than a simple scrubbing with random data. In fact performing the full 35-pass overwrite is pointless for any drive since it targets a blend of scenarios involving all types of (normally-used) encoding technology, which covers everything back to 30+-year-old MFM methods (if you don’t understand that statement, re-read the paper).

If you’re using a drive which uses encoding technology X, you only need to perform the passes specific to X, and you never need to perform all 35 passes. For any modern PRML/EPRML drive, a few passes of random scrubbing is the best you can do. As the paper says, “A good scrubbing with random data will do about as well as can be expected”. This was true in 1996, and is still true now.

C'mon, Ascomp. Wake up. Referring to 'the Gutmann Standard' makes it look as though you don't actually know what you're doing.