Quill.exe is a supplement for the letter-writing rpg, Quill.
Quill.exe is 23 pages, with a readable layout and some helpful graphics. The cover feels a little cluttered / not centered, but the mechanics beneath are super cool.
You do need Quill core to play this, but it's pay-what-you-want on drivethru, and there's a link to it on the page above. If you have Coal And Parchment, you can also use that here, and a link to where you can pick it up is given in the pdf.
Settingwise, in Quill.exe, you play as someone aboard a cryo ship in the far future, communicating via relay beacon with others. It's hard-fi, but it isn't unapproachable.
Exe gives you a variety of character classes to choose from, and the flavor behind each is nice. Probably the most interesting of the batch is the Stowaway, who has a heck of an automatic hook, but the other classes feel solid too.
In addition to character classes and rules conversions, Exe also comes with several scenarios. They each have a unique flavor and variant rules, and feel well-designed to fit the scope of the system.
Overall, if you want to take your game of Quill to a novel and very appropriate hard-fi setting, I'd recommend picking this up.
Alternately, Exe might make for an interesting companion to a game of Alien, as its atmosphere, classes, and mechanics dovetail very well with the setting, and could produce an immersive minigame between sessions.