Tracking task for extensions that aren't bundled with or otherwise maintained by WMF.
See also {T160813}
From https://codesearch.wmflabs.org/extensions/?q=wgMemc&i=nope&files=&repos= :
[ ] extensions / ArticleFeedbackv5
[ ] extensions / AutoProxyBlock
[ ] extensions / BlogPage
[ ] extensions / CategoryTree
[ ] extensions / CentralNotice
[ ] extensions / CheckUser
[ ] extensions / CloseWikis
[ ] extensions / CodeReview
[ ] extensions / Comments
[ ] extensions / ConfirmAccount
[ ] extensions / ConfirmEdit
[ ] extensions / DoubleWiki
[ ] extensions / ExtensionDistributor
[ ] extensions / ExternalData
[ ] extensions / FanBoxes
[ ] extensions / FeaturedFeeds
[ ] extensions / FlaggedRevs
[ ] extensions / Flow
[ ] extensions / GlobalUserPage - https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/GlobalUserPage/+/566408/
[ ] extensions / GoogleNewsSitemap
[ ] extensions / HAWelcome
[ ] extensions / HelpPages
[ ] extensions / ImageRating
[ ] extensions / LdapAuthentication
[ ] extensions / LinkFilter
[ ] extensions / LiquidThreads
[ ] extensions / MobileFrontend
[ ] extensions / NewSignupPage
[ ] extensions / NumberOfWikis
[ ] extensions / OnlineStatusBar
[ ] extensions / OpenID
[ ] extensions / OpenStackManager
[ ] extensions / PageImages
[ ] extensions / PageTriage
[ ] extensions / PictureGame
[ ] extensions / PollNY
[ ] extensions / ProtectSite
[ ] extensions / QuizGame
[ ] extensions / RandomGameUnit
[ ] extensions / RandomImageByCategory
[ ] extensions / RegexBlock
[ ] extensions / RSS
[ ] extensions / SecureSessions
[ ] extensions / SharedHelpPages
[ ] extensions / ShortUrl
[ ] extensions / SiteScout
[ ] extensions / SocialProfile
[ ] extensions / SpamBlacklist
[ ] extensions / SpamRegex
[ ] extensions / SpecialNamespaces
[ ] extensions / SportsTeams
[ ] extensions / StopForumSpam
[ ] extensions / TextExtracts
[ ] extensions / TimedMediaHandler
[ ] extensions / UploadWizard
[ ] extensions / UserStatus
[ ] extensions / UserThrottle
[ ] extensions / Video
[ ] extensions / VoteNY
[ ] extensions / wikihiero
[ ] extensions / WikimediaMaintenance https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/WikimediaMaintenance/+/566342/
[ ] SemanticMediaWiki / SemanticSignup
[ ] Wikifab / PageViewsProperty