user2493: Given the wide variety of possible solutions from keyboard firmware to operating system specific solutions, I'd like to leave the question wide open in order to discover which solutions are actually most commonly used by people who have this need in 2021.
I am personally most interested in solutions that work for the macOS and Linux operating systems.
Although iOS and Android solutions are also of interest to me.

user471: Please try: fsnow Pali keyboard which works on Windows.
Pali is usually rendered in Roman/ Latin characters with diacritical marks - the same ones used by Sanskrit. Pali doesn't have its own script. However, I think it's possible to render Pali also in the Sinhala script and the Devanagari script (used by Sanskrit). Hence, you can also use keyboards that render Roman/ Latin characters with Sanskrit diacritical marks, Sinhala script and Devanagari script.

user254: There are some topics with answers on discourse.suttacentral.net

Pali keyboard on mac os x
Insert Pali and Sanskrit Characters with diacritical marks


2493: <p>Given the wide variety of possible solutions from keyboard firmware to operating system specific solutions, I'd like to leave the question wide open in order to discover which solutions are actually most commonly used by people who have this need in 2021.</p>
<p>I am personally most interested in solutions that work for the macOS and Linux operating systems.
Although iOS and Android solutions are also of interest to me.</p>
 471: <p>Please try: <a href="http://fsnow.com/pali/keyboard/" rel="nofollow noreferrer">fsnow Pali keyboard</a> which works on Windows.</p>
<p>Pali is usually rendered in Roman/ Latin characters with diacritical marks - the same ones used by Sanskrit. Pali doesn't have its own script. However, I think it's possible to render Pali also in the Sinhala script and the Devanagari script (used by Sanskrit). Hence, you can also use keyboards that render Roman/ Latin characters with Sanskrit diacritical marks, Sinhala script and Devanagari script.</p>
 254: <p>There are some topics with answers on <code>discourse.suttacentral.net</code></p>
<ul>
<li><a href="https://discourse.suttacentral.net/t/pali-keyboard-on-mac-os-x-el-capitan/4558" rel="nofollow noreferrer">Pali keyboard on mac os x</a></li>
<li><a href="https://discourse.suttacentral.net/t/insert-pali-and-sanskrit-characters-with-diacritical-marks-on-discourse-and-operating-systems/311" rel="nofollow noreferrer">Insert Pali and Sanskrit Characters with diacritical marks</a></li>
</ul>
