Artifact - Artifact is a Multiplayer and Collectible Card video game published by Valve Corporation.
Cockatrice - Cockatrice is an open-source, multiplatform program for playing tabletop card games over a network.
Argentum Age - Argentum Age is an open source digital collectible card game with tactical positioning.
ForgeMtG - Forge is an implementation of Magic the Gathering that lets you play against a computer AI opponent using most of the rules of a real game. You can construct decks for you and the computer to play with, or play in a draft or a sealed deck format.
Anchor.fm - Record bite-sized podcasts that anyone can join ⚓
XMage - XMage allows you to play Magic against one or more online players or computer opponents.