Question: I'm currently working on my own golfing language which is based on Python 3. Once this language is finished, what would be the best way to let other people use it? I know TIO is very widespread here, and that some users' languages are on TIO - is there a way to get my language on TIO as well (and, if so, would there be an easy way to maintain my language if I wanted to add an update)?

As it stands right now, this language is far from complete (and doesn't actually have a name yet, so I'm open to suggestions). This language will get its code through a single `parse(String)` method, where `String` is the code itself.

Answer: 
Try It Online! is maintained by a PPCG user, [Dennis](https://codegolf.stackexchange.com/users/12012/dennis), and has a [chatroom](https://chat.stackexchange.com/rooms/44255/talk-tryitonline-net) for discussion around it. This is the most common way to request a language be added and maintained (other ways are listed on [TIO's home page](https://tio.run/#)). However, at time of writing, Dennis is currently inactive (reasons can be found starred in [talk.tryitonline.net](https://chat.stackexchange.com/rooms/44255/talk-tryitonline-net)), so while you can (and should) request your language to be added, I wouldn't expect it to happen soon.

Aside from TIO, you should take a look at [this](https://codegolf.meta.stackexchange.com/questions/14927/tips-for-launching-a-language) page, which asks similar questions about how to popularise your language. The most common method is to make the code publicly available (e.g. Github) and start answering in the language.

Furthermore, don't hesitate to swing by [The Tarpit](https://chat.stackexchange.com/rooms/110136/the-tarpit), a chatroom for creating languages.
Port the Interpreter to JavaScript
==================================

Most of the answers here don't actually answer the question of how to best make the *interpreter* accessible to everyone. So I'll add a way that opens up the programming language to easy online usage.

Here is the process I'd use to make an online interpreter (it may not be the most efficient way, but thus far, it's the only way presented)

Step 1: Create a simple user interface
--------------------------------------

Ensure these things are present on the page:

* Code box (where the program goes)
* Input box (where the program's input goes)
* Output box (self explanatory)

Step 2: Actually translate the base interpreter to js
-----------------------------------------------------

Turn the program in the non-web-friendly language into js line by line.

You could look at transpilers (in this case, python to js). But make sure that it translates it properly. An example python transpiler is Transcrypt.

Step 3: Link js and html
------------------------

This is pretty simple: use things like `<script>` tags to include the js files.

And that's it. This is highly oversimplified, but it's a reasonable method of making an online interpreter.

I'd recommend hosting your interpreter on something like Github Pages (which is 100% free).