i mean atlest most popular ones, RED and BLUE GREEN -derived variations.
like say ARED(for adaptive, yet agressive self-tuning), RRED(for DDoS -proof environament/applications), SPI-RED and NPD-RED combo, ERED, GRED, LRED, SARED, PD-RED, AP-RED, GRED/AGRED, FRED, ENRED and etc.
personally i was particular interested in SARED, APRED, RRED and perhaps PD-PRED and GRED/AGRED would be quite handy for very generic/majority of users aswell as those.
also BLUE also was because no hash math used - was less CPU-intensive than yet popular SFQ, among other benefits it have. so having SFB and RSFB would very helpful for many.
(not sure about early "fuzzy" versions of it)

some bibliography o-t:
https://www.emis.de/journals/HOA/MPE/Vo ... 872347.pdf
http://sdiwc.us/digitlib/journal_paper. ... 000161.pdf
http://scholarworks.rit.edu/cgi/viewcon ... ext=theses
https://pdos.csail.mit.edu/~rtm/papers/fred.pdf
http://citeseerx.ist.psu.edu/viewdoc/do ... 1&type=pdf
http://www.icir.org/floyd/papers/adaptiveRed.pdf
http://www.ece.umd.edu/~hyongla/PAPERS/ITC03_ared.pdf
https://cse.uta.edu/research/Publicatio ... 2005-6.pdf
http://paper.ijcsns.org/07_book/200605/200605A08.pdf
http://www.archipel.uqam.ca/3071/1/M9440.pdf
https://www.utwente.nl/ewi/dacs/assignm ... jkstra.pdf
https://www.cs.indiana.edu/~kapadia/papers/green04.pdf
http://www.mdpi.com/2297-8747/14/1/65/pdf
http://www.ee.cityu.edu.hk/~zukerman/c114.pdf
http://www.um.ac.ir/modules/Professors/ ... s/p1202116
http://www.archipel.uqam.ca/3071/1/M9440.pdf
http://citeseerx.ist.psu.edu/viewdoc/do ... 1&type=pdf
http://up.jiaeee.org/_file_26c0be4bb73a ... 773e_7.pdf
http://www.ticaret.edu.tr/uploads/kutup ... M00105.pdf
http://cs.gmu.edu/~huangyih/756/blue.pdf
http://www.thefengs.com/wuchang/blue/41_2.PDF

p.s.
REM, DROPTAIL and even PURPLE(;-) AQM isn't yet developed/imprvoed much in comparison to above, but intersting ideas behind some.