Penguin paperback (translation only)
https://www.amazon.com/Domesday-Book-Complete-Translation-Historical/dp/0140515356/ref=sr_1_3?s=books&ie=UTF8&qid=1512979212&sr=1-3&keywords=alecto+domesday
Potted history while on the subject
1783 - transcribed by Abraham Farley and printed in a special font. No translation. V expensive, v rare book.
1860s - Henry James printed photocopies, still no translation. Some online.
Then you had an emperor's new clothes thing where everybody could access it and nobody could admit they didn't understand it, because they didn't know enough about feudal England.
By about 1900 they thought they knew enough for the Victoria County History to include a translation for the county in Vol 1 of each county set. The Vol 1s seem to be missing on the BHO site, but some are scanned eg Surrey
https://archive.org/stream/historyofsurrey01malduoft#page/n357/
Some counties don't have a Vol 1 yet.
The translations are said to be inconsistent because they were done by different people over a long period.
1975 - new translation by John Morris, published by Phillimore in 39 volumes. Wikipedia says it didn't replace VCH as the most authoritative. Hull University has a digital version by JJ (John) Palmer, which might be downloadable, but I didn't have the patience to penetrate the website.
1985 - TNA had to rebind the books, so while they were dismantled they photographed them in colour on full-size glass plates with a camera the size of a car.
Alecto under GH (Geoffrey) Martin then did a new set of facsimiles from the new photos and an upgrade of the VCH translation to standardize it. Various editions including the Penguin paperback.
VCH now tell writers of new volumes to use Alecto instead of their own in Vol 1.
For genealogy, Keats-Rohan's Domesday People is more useful. It collates Domesday with all the other records and extracts all the people with any known genealogy (only a small minority).
For reference
Palmer's scans of the new photos
http://opendomesday.org/book/gloucestershire/10/
PASE database
http://domesday.pase.ac.uk/
TNA has Alecto pay-per-view
http://www.nationalarchives.gov.uk/help-with-your-research/research-guides/domesday-book/#6-accessing-domesday-online
Another project (incomplete)
http://www.domesdaybook.co.uk/index.html