Oldnet Search Engine: Wiby.
Increases the quality on any image. (Especially Anime): Waifu2x.
Collection of Freeware and Shareware: MajorGeeks.
Forum for P2P software such as LimeWire/Making old p2p software work in 2020: Gnutella Forums.
Reviving AIM in 2020, useable as of 4/5/20: AIM.
Favorite internet browser, highly customizable: Palemoon.
Inspiring news stories/articles: GoodNewsNetwork.
Mario ROM Hacks: SMWCentral.
Researching active Phone Scams with live working telephone numbers: Scammer.info.
Doom WADs and other things: Doomworld.
Huge collection of Imageboard music: these posts on plus4chan.
Dead imageboard website that was great in it's glory days, go revive it!: 7chan.
My personal (free) usenet provider: Eternal September SABnzbd.
Internet Chess Club: ICC.
Torrent client that you can also use as a torrent search engine: Frostwire.
Extract audio from any CD: AudioGrabber.
Large collection of software to customize most versions of Windows: Winaero.
Free Anime dubs, subs, music, OST, instrumentals, screensavers, icons, etc...: Nyaa.si.
Reviving old versions of Windows messenger, hundreds online daily: Escargot.
More to come.