They are both available from e.g. GOG, which sells DRM-free games. I'm not going to link to e-commerce sites in a thread about public domain music, sorry.
Two great action stealth games came out in 2012 that share many similarities (or perhaps, their Thief legacy): Dishonored and Mark of the Ninja. The latter is by far the best gameplay wise; Dishonored has unsurpassed world-building. Sometimes I idly think of just modding Dishonored's setting and visual design into Mark of the Ninja.
Here's an official statement, if you like, regarding Dishonored: https://twitter.com/gogcom/status/1229435857213575173
Mark of the Ninja: https://twitter.com/klei/status/1009866739172007936