Disclaimer: this list is outdated - nowadays most libraries work with ARC/ORC just fine

Works (and tested) with ARC

• https://github.com/zevv/npeg
• https://github.com/yglukhov/variant
• https://github.com/yglukhov/nimpy
• https://github.com/gokr/spryvm (compiled with ARC by default)

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Works (and tested) with ORC

• https://github.com/bung87/htmlparser

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Works with ORC (as of writing)

• https://github.com/soasme/nim-markdown - https://github.com/nim-lang/Nim/issues/15039 Fully fixed in https://github.com/nim-lang/Nim/pull/15113
• https://github.com/nim-lang/irc - wrong sink parameter passing
• https://github.com/flyx/NimYAML - Works with a patch https://gist.github.com/Yardanico/b4aaf28ec157c330a7639103d892b9be crash when modifying a string with mitems iterator
• https://github.com/jabbalaci/nimpykot/

Works with ARC (as of writing)

• https://github.com/ba0f3/ptrace.nim - https://github.com/ba0f3/ptrace.nim/pull/2
• https://github.com/D-Nice/nbaser - https://github.com/D-Nice/nbaser/issues/6
• https://github.com/Nycto/RBTreeNim - partially fixed by https://github.com/nim-lang/Nim/issues/15024 , but still SIGSEGVs on some tests. Fully fixed in https://github.com/nim-lang/Nim/pull/15113
• https://github.com/treeform/flippy
• https://github.com/elijahr/lockfreequeues
• https://github.com/joachimschmidt557/nimmm
• https://github.com/BarrOff/roots (test fails, but it fails with refc and seems because of float precision)
• https://github.com/jackhftang/lrucache.nim
• https://github.com/rlipsc/polymorph
• https://github.com/jiro4989/faker
• https://github.com/jiro4989/wave
• https://github.com/fox0430/moe - https://github.com/nim-lang/Nim/issues/14994
• https://github.com/johnnovak/illwill
• https://github.com/jangko/msgpack4nim
• https://github.com/StefanSalewski/gintro
• https://github.com/treeform/typography
• https://github.com/bluenote10/NimData
• https://github.com/alehander92/gara
• https://github.com/GULPF/timezones
• https://github.com/bluenote10/NimSvg
• https://github.com/jangko/nimAES
• https://github.com/narimiran/itertools
• https://github.com/jangko/nimpdf
• https://github.com/vindaar/seqmath
• https://github.com/vindaar/shell
• https://github.com/ftsf/nico (tested the platformer example)
• https://github.com/nitely/nim-regex - [ARC] ICE with static objects
• https://github.com/trustable-code/NiGui - [ARC] Incorrect sinking of an argument?
• https://github.com/avahe-kellenberger/nimdow - need to replace two cast[Pcuchar](wmName) with cstring(wmName) in windowmanager.nim
• https://github.com/oprypin/nim-random - ARC codegen bug with inline iterators
• https://github.com/cheatfate/nimcrypto - ARC codegen bug with inline iterators

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Won't work in arc without changes in the libraries:

• https://gist.github.com/Yardanico/5a9f7e9842101443ebf662c58340f406#gistcomment-3289689:
  • https://github.com/brentp/hts-nim doesn't work
  • https://github.com/brentp/mosdepth doesn't work because hts-nim doesn't work

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A bug or not yet sure:

• https://github.com/jangko/nimAES/ - a bug in the library itself, read https://irclogs.nim-lang.org/21-07-2020.html#23:28:13
• ARC: deepCopy in new runtime feature missing, do we have alternatives?:
  • https://github.com/PMunch/nim-persistent-vector: because of deepCopy here
  • https://github.com/NimParsers/parsetoml: uses deepCopy too
• https://github.com/mratsim/Arraymancer: known, issue here
• https://github.com/Vindaar/ggplotnim: blocked by arraymancer
• nimsuggest - compiles if you put ~10 {.nosinks.}, but fails for the first nimsuggest test.
• https://github.com/PMunch/nimlsp - doesn't work as it depends on nimsuggest
• https://github.com/zedeus/nitter - [ARC] Undeclared variable in C with inline pragma and iterators - works if you workaround this bug (by removing inline pragma from some nim-regex functions) and add a few {.nosinks.} annotations.