Let's make something like wiki page here on github with links to all projects related to far2l. One of main advantages of Far for Windows was rich ecosystem, and I see no reason why far2l should have lesser possibilities to have a wider one (actually ecosystem already exists and growing, even although main project still declared as alpha). As we have no wiki page (or something like plugring ;) yet, let's start right here.

Macros
A collection of keyboard macros for Linux port of FAR v2:
https://github.com/corporateshark/far2l-macros, useful for example if you use a MacBookPro 13" keyboard, which doesn't have keys such as Ins.

Plugins
GVFS plugin (rich set of network protocols supported): https://github.com/cycleg/far-gvfs
FUSE plugin (sshfs usage simplified): https://github.com/unxed/far2l-fuse
editwrap plugin port: https://github.com/unxed/far2l-EditWrap (good example of rather simple plugin porting)
Lua plugin: https://github.com/shmuz/LuaFAR-2L
sample plugin in FreePascal: https://github.com/unxed/far2l-fpc-helloworld

Compatible apps
putty4far2l - putty fork with far2l terminal extensions (all hotkeys, clipboard):
https://github.com/unxed/putty4far2l
kitty - terminal with far2l extensions also supported:
https://github.com/cyd01/KiTTY
Far2lRestore - imports Windows Far .reg settings to far2l:
http://alter.org.ua/ru/soft/linux/far2l_reg/

Packages/builds/build scripts
PPA: https://launchpad.net/~far2l-team/+archive/ubuntu/ppa
Custom .deb's: https://github.com/unxed/far2l-deb/
Amazon Linux build script: https://github.com/unxed/far2l-deb/blob/master/misc/amazon_linux_far2l.sh
Fedora build howto: https://github.com/nvv13/far2l/commit/c94226c4ffb68f6a21c263cda6ba94338a03e51d
Alt Linux build spec: vitlav@9e6b6da
Cygwin howto: #583 (comment)
nixpkgs (linux & darwin): https://github.com/NixOS/nixpkgs/tree/master/pkgs/applications/misc/far2l
rpm (centos/fedora): https://github.com/polter-rnd/far2l-rpm/
portable build (for "shared" hosting, etc): #647 (comment)

Notable forks (see branches also)
Alter1 (slow copy fix, unicode detection fix, KOI8-U, etc) https://github.com/Alter-1/far2l
ha3flt (hidden files display mode shown) https://github.com/ha3flt/far2l
l-4-l (pdf support in multiarc) https://github.com/l-4-l/far2l
svost (large code cleanup work) https://github.com/svost/far2l
singalen (macos build fixes) https://github.com/singalen/far2l
shmuz (adoption for better Lua support): https://github.com/shmuz/far2l

Colors
Monokai-inspired color theme #791 (comment)