I don’t cover the Third-Party Viewers as much as I used to. I think Project Bento is a change that will make any viewer without Bento capability obsolete. Some Third Party Viewers are already Bento capable. Here is what I have found.
…and I may have made mistakes about which viewer does and doesn’t have Bento capability. If you see one please correct me.
Alchemy – last update June 25, 2016. No Bento support. Expect it in their next release. But, I have no idea when that may be.
Black Dragon – last update November 2, 2016. Second Life as Seen Through the Black Dragon Viewer – April 2016. There are 19 comments about BD at the end of the article. I like Black Dragon and Cool VL Viewer. I use neither because their user interface has diverged enough from the basic Linden UI I find it frustrating. If you have a newer computer and don’t mind learning the UI, BD is an interesting choice. NiranV’s blog is here. The current version of BD has Bento capability, not the latest but near enough.
The Snapshot panel in the Linden Viewer and most third party viewers is mostly from NiranV and his work with Black Dragon.
Catznip – last update January 2016. I am told there is a Catznip alpha version viewer in progress that has Bento. But, the site says alpha use is by invitation only.
Cool VL Viewer v188.8.131.52 (stable) – last update November 5, 2016. There is a v184.108.40.206, which is an experimental branch with Bento skeleton support.
Firestorm 220.127.116.11527 – last update August 8, 2016. The team plans for 4 releases per year. So, by the schedule-goal we can expect a release this month. But, bugs, holidays, and a number of other factors influence the release date. Don’t hold your breath but, hope.
The next release of Firestorm will have Bento capability. You can join the Phoenix-Firestorm Preview Group and get the links to the test version. If you do, remember. The team does not support the beta version… the idea is you use the beta to support the team in developing it.
Kokua 4.1.1 – last update October 2016. No mention of Bento capability. So, I assume it does not have it. It may be Bento that is moving the developers to specialize their versions along separate paths for OpenSim and Second Life.
RLV – Restrained Love Viewer 18.104.22.168 – last update (NSFW) September 9, 2016. Avoid confusing RealRestrant with the RLViewer. The web site serves both.
I cannot find the latest release notes or any mention of Bento. So, I assume there is currently no Bento support.
Singularity 1.8.7 – last update June 16, 2016. However, they are making nightly builds, which isn’t every night, it’s just a name for a frequent type up updating. The last build shown is 2016-08-23 06:10:35. But, I don’t find any mention of Bento.
Asking in the group, I’m told no Bento in Singularity… yet.