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* qdbm, a higher-performance ''dbm'' employing many of the same techniques as Tokyo/Kyoto Cabinet. Written by the same author before they moved on to the cabinets.<ref>{{cite web |title=QDBM: Quick Database Manager |url=https://fallabs.com/qdbm/ |website=fallabs.com |date=2006}}</ref>
* tdb, a simple database used by [[Samba (software)|Samba]] that supports multiple writers. Has a gdbm-based API.<ref>{{cite web |title=tdb: Main Page |url=https://tdb.samba.org/ |website=tdb.samba.org}}</ref>
* [[Berkeley DB]], 1991 replacement of ndbm by [[Sleepycat Software]] (now [[Oracle Corporation|Oracle]]) created to get around the AT&T Unix copyright on [[Berkeley Software Distribution|BSD]]. It features many extensions, hashing, and B
* [[Lightning Memory-Mapped Database|LMDB]]: [[copy-on-write]] [[memory-mapped file|memory-mapped]] [[B+ tree]] implementation in [[C (programming language)|C]] with a Berkeley-style API. Has improvements to parallelism. After Oracle relicensed Berkeley DB under [[GNU AGPL]], LMDB is increasingly used as a replacement.<ref>{{cite mailing list | url=https://lists.debian.org/debian-devel/2014/06/msg00338.html | title=New project goal: Get rid of Berkeley DB (post jessie) | mailinglist=debian-devel | date=June 19, 2014 | author=Ondřej Surý |publisher=[[Debian]]}}</ref>
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