What are /r/CorruptionofChampions' favorite Products & Services?

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Doing so is not terribly difficult, and there are any number of tools you can use to make it. There aren't any "tutorials" for whole projects, but you can piece together how to do it with a little careful thought.

There are even platforms built for exactly this kind of thing: interactive fiction with a tool like Inform (see TrapQuest for an example), and RenPy (which is used for visual novels).

All you need is:

• A table (or object) that keeps track of your character's stats, and a similar table for each NPC's stats. (In the Lua programming language, you'd probably just use a native table. In JavaScript, you'd use a normal object. In Python, you'd probably want to use a dictionary or a class.)
• A table (or array) that holds the list of locations and how they connect. This table will contain the description of the location, a list of any objects or NPCs in the area, and the list of connections to other locations or actions you can perform. (In the case of CoC, it's the list of buttons that appear on the bottom. There are other, better ways to do it.) It might even contain a list of the probabilities of the appearance of particular enemy types.
• Some code to handle modifying location flavor text or character descriptions (or anything else) based on the contents of the relevant character tables. CoC does this by putting all the flavor text as the return value of a function, and it's simply appended together with the output of functions that get appropriate information from the player object.
• Some code to handle encounters - dealing damage, casting spells, etc. This will be attached to whatever actions are available at a given location.

The only hard part is putting it together and adding content that's fun.

Fen doesn't do the mobile versions himself. FutaContractor does, and they apparently haven't gotten around to it yet. (FC also does the TiTS APKs and IPAs, I believe.)