Derpibooru Community Collab! It is time for us to make another community collab image! Let us all have fun and draw some pony. Learn how to participate here.

Best Derpibooru alternative, in case the worst happen?

Background Pony #2481
Now I don't think that Derpi will be shutting down anytime soon but in case that does happen(or they piss everyone off again, please don't do that), what are the best alternatives to Derpibooru? And please don't say Twitter…
Luna
Luna - For Patreon supporters
Woona - Derpi Supporter
My Little Pony - 1992 Edition
Best Art Program Ever - I get the badge because I made the event >:V
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
A Perfectly Normal Pony - <meow> byte[] permission to suck your dick
Dream Come True! - Participated in the MLP 9th Anniversary Event
Toola Roola - For helping others attend the 2019 Community Collab
Investor - Lootboxes are just another form of gambling

Luna Best Pony~
There won't be anymore drastic policy changes, and we won't be shutting down anytime soon.

As for alternatives, really any other danbooru-style imageboard, such as furbooru or e621. You could also consider furaffinity. Honestly I think everyone should use as many sites as they see fit and not depend on one particular resource. Helps discover content we wouldn't normally look for or expect, yet end up loving.
Background Pony #1CDB
@Luna
such as furbooru

1: Stop shilling your site using your non staff alt.
2: I'd assume the person wanting alternatives wants mlp alternatives and not furry.

I'd recommend the second from bottom on the left on Marker's link.
Background Pony #EEB1
@Background Pony #2481
Ponybooru.org: Relatively similar to Derpibooru in regards of rules and policies, including DNP policies for artists, and the most active booru of the alternatives available. Some artists who were mad at Derpi moved to this booru and post exclusively on it, and politic pics don't seem to cause controversy there. Recommended if you use Derpi for the active community.
Twibooru.org: The complete opposite of Derpibooru and Ponybooru. It's an archive first and foremost and even has thousands of images that no longer are available on Derpi. It allows all kind of content (including some stuff banned on Derpi) if it's sufficiently pony-related, it doesn't have DNP policies (which means stuff from artists with DNP can and may be uploaded there), disables comments by default and its forum only exists for technical stuff. Recommended if you come to Derpi for the pics rather than for discussion.
Ponerpics.org: The owners not only imported almost all of Derpibooru's content, but they managed to keep the original file IDs and scores, which helps to curate content. Similar to Twibooru, Ponerpics doesn't have a DNP policy, but unlike the former comments and the forum are open for everyone here. Recommended if you want a middle point between the two boorus listed above.
Manebooru.art: This booru has stricter content policies than Derpibooru since it bans all Nazi content and foalcon. Politic discussion is discouraged there as well, since "controversial" art is required to have its comments disabled. Downvotes are disabled as well. Like Ponerpics, Manebooru is importing art while keeping the original IDs, and they have a program where verified artists can have their art imported earlier. Recommended if you don't want to see "controversial" politics at all.
Bronyhub.com: This booru still is in development, but according to its owner it will cover things other boorus ignore. Aside from the WiP booru, a fully fledged forum powered by MyBB, a pastebin service powered by Privatebin, a Discord server and a Rocket.chat server are in the works. If they play their card rights this site could become an interesting hub for the MLP fandom.

Note that my opinions on these sites come from superficial personal experiences (aka using them for a quick fap). More assiduous users and staff from these sites are free to correct me.
Background Pony #BF4D
@Marker
and furbooru forbids (certain) foalcon content.

Which is an advantage for all those who don't want to see that content because they might be happy with the default available filters. (same for manebooru)
Background Pony #E120
Deletion reason: Rule #6 Not related to the topic, if you want to criticize the site staff do it elsewhere.
Background Pony #E120
And replying to OP: I'd recommend Ponerpics or Twibooru.
The first has forums while the second it's mostly pics and archive.
Ponybooru is the most similar site to Derpi, but some policies aren't good enough.
Bronyhub is still developing but it's sounds interesting by the info we have about it.
I'd suggest avoiding Manebooru because is just Derpi with even more censorship.
Background Pony #C2B7
Ponybooru, Twibooru, Ponerpics, Bronyhub: allow neonazi propaganda, allows racism & sexism, mostly ignore artists rights and wishes
Derpibooru: team seems undecided (my personal opinion), deletes the worst content, but not all of it. Respects artists rights and mostly also artists' wishes.
Furbooru, Manebooru: do not allow neonazi propaganda or racist/sexist content. Tender to artists wishes. Also do not allow content which is considered to be childporn in many countries.
Background Pony #EEB1
@Background Pony #C2B7
I guess this settles it. Ponybooru, Twibooru, Ponerpics and Bronyhub seem to be the best options from an user's point of view since they allow more content. Also it seems that Ponybooru has DNP lists, so your part about "ignore artists rights and wishes" isn't completely correct.
Boxless

stop using Derpi lmao
@Background Pony #2481
Unironically begin sitehopping. Don't put all your eggs in one basket anymore, especially after the last debacle. Others in-thread have already given good lists (except C27B, filters exist) but i'll plug that altbooru list site again just for good measure.

@Luna
While correct on sitehopping, neither the Furry Clone nor the Furry Image Dump fit the title of 'pony booru.', please don't shill them as alternatives for the role that they don't fulfill, thanks. I will appreciate the fact that you did so personally instead of on your admin account, though. It's an improvement.
Background Pony #C2B7
@Background Pony #EEB1
so your part about "ignore artists rights and wishes" isn't completely correct.

I'd suggest you to google (or search in twitter) how bunch of artists struggled and often failed to get their content deleted from Ponybooru. The main owner & operator of the servers is a backup-everything guy who also operates ThePonyArchive. So, no, they don't care about artists copyright, they only care once you are about to legally send them a DMCA.

Oh, and ponybooru hosts lots of images that they imported from derpibooru without complying to the artist-upload-only dnp here on derpibooru.

@Background Pony #EEB1
the best options from an user's point of view

If you are a user who even slightly cares about the artists who created the content, then your assumption is wrong. Use a booru that respects the artists license requirements / dnp entries.
Luna
Luna - For Patreon supporters
Woona - Derpi Supporter
My Little Pony - 1992 Edition
Best Art Program Ever - I get the badge because I made the event >:V
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
A Perfectly Normal Pony - <meow> byte[] permission to suck your dick
Dream Come True! - Participated in the MLP 9th Anniversary Event
Toola Roola - For helping others attend the 2019 Community Collab
Investor - Lootboxes are just another form of gambling

Luna Best Pony~
@Boxless
please don't shill them as alternatives for the role that they don't fulfill, thanks.

I'd argue, but honestly you're right, for those looking for an archive of "all pony" with all the niché things that the fandom has, my suggestions would almost certainly not cut it. However I'd like to point out that the intention of my post was more to say that it's good to use all the different resources there are, and not rely on one single source. It helps us see content we like that could otherwise have flown under our radar entirely.

I wasn't really trying to "shill" any site as you say, or at least it wasn't my intention, Furbooru came to mind first because I work on it, so I mentioned it. I just don't use or visit many other sites at all, I prefer to stay in a small circle of sites and things that I already know of…. quite ironic, yes I know. And I ended up not being true to the OPs question as a result. However, I can't recommend something that I don't myself use, but I still wanted to see if I can be of any assistance to the OP.

Oh and I use my personal account for things that I think personally, while my staff account is for when I talk on behalf of the site itself.
Boxless

stop using Derpi lmao
@Luna
Hey, you don't see me directly shilling (advertising) the one i help with.

At least you're doing better at it than your peers, but that's uh… that's really, really not a high bar to set.

@Background Pony #C2B7
[CITATION OVERDUE]
Background Pony #C2B7
I don't want to drag any specific artists into this and I would first have to ask those people for permission to be legally allowed to cite them (at least in the country where I live as well where derpi is hosted). It is literally just opening twitter, entering "ponybooru DNP" in the search field and pressing enter. If you are even too lazy for that, click here: https://twitter.com/search?q=ponybooru%20DNP
PUBLIQclopAccountant
Magical Inkwell - Wrote MLP fanfiction consisting of at least around 1.5k words, and has a verified link to the platform of their choice

Pubilq Phirm
@Background Pony #C2B7
By posting a public status to Twitter, they have granted implicit permission for any and all incoming links. Also, Philomena doesn’t automatically convert URLs into clickable links (which is annoying when all you want is for the click text to be the URL).
Marker
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Magnificent Metadata Maniac - #1 Assistant
Not a Llama - Happy April Fools Day!

Misanthrope
@Boxless
I also advocate for sitehopping, IMO it's the best way to ensure the images I have fave'd is safe from the ever mercurial whims of artists, OC owners, or staffs. Short of downloading them all of course, but that makes them hard to organize.
Background Pony #0336
@Marker
but that makes them hard to organize.

If that's your only issue, may I suggest Hydrus? It organizes images through tags like the booru does, and automatically tags images downloaded from the site, although occasionally you need to check the parser is looking for all the data-tag-categories. For the longest time it wasn't looking for "content-fanmade" and never tagged anything with series, art pack, or other pink tags.

The derpi downloader is built in, but I can provide ones that work with the alts if you'd rather not do it yourself.
DragonRanger
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Fine Arts - Two hundred uploads with a score of over a hundred (Safe/Suggestive)
Perfect Pony Plot Provider - 10+ uploads with over 350 upvotes or more (Questionable/Explicit)

The ones I prefer are Ponybooru and Twibooru. There’s a lot more freedom to post whatever without having the mod team breathing down your neck for wrongthink.
Background Pony #14A6
@DragonRanger
You know they are run by the same people i dont trust any mlp booru i give you this advice dont trust any side made by bronies
Interested in advertising on Derpibooru? Click here for information!
Champions of Equestria

Derpibooru costs over $25 a day to operate - help support us financially!

Syntax quick reference: *bold* _italic_ [spoiler]hide text[/spoiler] @code@ +underline+ -strike- ^sup^ ~sub~