Having noticed that there didn’t seem to be any tool or website out there to automatically keep track of completion of encounters and quests (without having to resort to editing a big clunky spreadsheet manually), I decided to build my own, fully free and open-source!

Current features:
List of all encounters, main questlines, and notable challenges with automatic completion, per-character
Up-to-date, fully customizable list of weeklies and dailies, with completion and automatic reset, per-character
Multi-character support / alt-friendly

Planned features for the near™ future:
More information for encounters, quests, and checklists (break down of individual quests, how to unlock, description, etc.)
Profile-sharing with a URL
Sign-up / device syncing (so your checklists syncs from your computer to your mobile, and vice-versa)
Comparison features (compare two or more characters’ completion)
List of features and content in the game (with how to unlock, description), ranging from the Gold Saucer to PvP to Sightseeing Logs and everything in-between
Support for the game’s main languages (DE, FR, JA, KO, ZH) pending finding resources to translate in those languages

Let me know what else you’d like to see or what you like about it! Hopefully this is useful to some of you! I am grateful for any feedback and suggestions either in the comments, DMs, or on Twitter.

Website: https://xivtodo.com/
Twitter: https://twitter.com/XIVToDo
GitHub: https://github.com/bourgeoisor/xivtodo

Slightly outdated screenshots: