Given your profile, here are three unsolicited software ideas with their justifications. I'd make them myself, but I don't have the time or the dedication (I'm not Catholic--mostly because any Integralist state would burn me at the stake for similar if not identical reasons the "secular arm" burned Bruno). Perhaps you might know someone who does.

1. A fork of HamTrainer (https://f-droid.org/en/packages/com.practicalapps.hamtrainer...) using the Baltimore Catechisms I-IV as its test banks. The point of a catechism is to actually be able to memorize it and to be able to reflect upon the dogmas of the Church at will. The current catechism is great as its intended purpose as a reference, but the actual regional catechisms (YOUCAT, Adult Catechism et. al) often fail to summarize the tenets in a digestible and rote way. If RCIA fails to be a uniformly "good" experience due to its reliance upon volunteers, effectively automating the ingestion of the dogmas of the Church makes (to my mind) perfect sense for the sincere would-be initiates. It would be trivial to transform the Gutenberg transcriptions of the Baltimore catechisms into the multiple choice format used by HamTrainer. The main difficulty would be curating a meaningful set of "wrong" answers.

2. A fully macronized and properly put together epub3 (ala Standard Ebooks) of the Nova and/or Clementina Vulgata. The Latin Macronizer (https://github.com/Alatius/latin-macronizer) would perform most of the heavy lifting. Any errors or absences could be iteratively corrected once the scaffold was in place. Given the primacy of the Vulgate in the Catholic Church, it's a little disappointing that the Nova Vulgata is freely available as a Vatican website, but no one has put together an actual proper ebook of it. Ditto with the Divine Office, but this would probably destroy the livelihood of some individuals.

3. Syntax highlighting for Latin with Whittaker's Words (https://en.wikipedia.org/wiki/William_Whitaker%27s_Words) providing most of the heavy lifting. The number one issue people seem to have with learning Latin is the inability to decode the appropriate tense and inflection at speed. Syntax highlighting for (macronized) Latin is the obvious choice for simplifying this process until it becomes second nature for the user.