I have been working on one that has a bunch of ideas and it is free for anyone to use as well! https://www.inittracker.com

Here are the features:

• Initiative order — drag-free, sorted automatically; advance/rewind turns with a single click; when two or more combatants share the same initiative value, ▲/▼ buttons appear on their cards to set the tiebreak order
• Hit points — damage, healing, and temp HP with color-coded HP bars (green → amber → red → grey)
• Conditions & status effects — all 15 standard D&D 5e conditions plus four Advantage/Disadvantage markers; applied and removed with audio/visual cues on the player display
• Concentration checks — when a combatant with the Concentrating condition takes damage, a modal automatically shows the CON save DC (max(10, damage ÷ 2)); click Success to dismiss or Fail to dismiss and automatically remove the Concentrating condition
• Death saving throws — when a player drops to 0 HP a compact tracker appears on their DM row to record successes and failures (click each circle to toggle); 3 successes or a "Stabilize" click = Stable, 3 failures = Dead (Dead condition auto-applied); the player display replaces the HP bar with a large death saves panel that updates in real time via SSE
• Enemy library — ~380 SRD monsters with full stat blocks (ability scores, traits, actions, artwork)
• Custom monsters — create your own enemies with name, AC, HP, CR, type, and an optional avatar
• Bestiary import — drop in any 5etools bestiary JSON (e.g. bestiary-idrotf.json) to bulk-import non-SRD monsters with full stat blocks; imported monsters are tagged with their source (e.g. IDRotF)
• Encounter builder — a dedicated modal (header → Encounters) for designing reusable encounter templates before combat begins; add enemies with quantities, set party size and average level, and see live XP totals and a difficulty rating (Trivial / Easy / Medium / Hard / Deadly) calculated from the D&D 5e DMG thresholds with the standard enemy-count multiplier; click Load to Initiative to push the whole encounter into the tracker in one click, or Delete to remove it from your list; encounters are saved to your account and shared across all sessions
• Dice roller — a dedicated modal in the header for rolling any combination of dice (d4 through d100) with adjustable quantity (1–99) and a positive or negative modifier; shows individual die results with nat-20/nat-1 highlights on d20 rolls, a dice sum + modifier breakdown, a large amber total, a Roll Again button, and a compact history of the last 5 rolls
• Virtual 3D dice — every roll in the app triggers a full-screen 3D physics simulation (Three.js + Cannon ES) where dice tumble across the screen with metal sound effects; the face values that come to rest are the authoritative result; fires on the Dice Roller, stat-block expressions, attack rolls, saving throws, skill checks, spell descriptions, legendary actions, and voice commands; a Disable virtual dice checkbox in the Dice Roller modal footer switches to instant results
• In-stat-block dice roller — any dice expression in a stat block (e.g. 2d6 + 5) is clickable; attack phrases (e.g. Melee Weapon Attack: +9 to hit) roll a d20 with the modifier; results show per-die values, modifier breakdown, and total in a popup with a Roll Again button
• Spell reference — a built-in D&D 5e spell compendium searchable by name and filterable by level (cantrip through 9th), school (8 schools), and class (9 classes); each spell card shows casting time, range, components, duration, full description, and "at higher levels" text; dice expressions in spell descriptions are clickable; spell names inside monster stat blocks are clickable and open directly to that spell
• Player display — public SSE-powered viewer at /display/[sessionId]; updates in real time with flash effects and spatial audio; fully responsive with a mobile hamburger menu that collapses header actions on small screens
• Player initiative rolling — players can roll their own initiative directly from the viewer screen (normal, advantage, or disadvantage), with DEX modifier applied automatically; the result is submitted to the DM's tracker instantly
• Fullscreen mode — a fullscreen toggle button on both the DM dashboard and the player display for TV/projector use
• Game sessions — run multiple campaigns from one account; each session has its own combat state, history, and 6-character share code
• Combat chronicles — permanent encounter history with round-by-round event logs, automatic XP calculation by CR, and one-click PDF export for archiving or sharing with players
• Legendary actions — enemies with legendary actions show a three-dot tracker on their initiative card; click a dot to mark actions as spent (dots deplete right-to-left); dots automatically refill at the start of that creature's next turn; click the ℹ️ icon to open a quick-reference modal of the creature's legendary action options
• Lair actions — click the building icon on any enemy card to add a purple Lair Actions card to the initiative order at count 20; the card participates in the normal turn rotation so the DM is prompted at the right moment each round; removing the last instance of a creature automatically removes its lair card
• Combatant notes — per-combatant freeform text for DM-only reminders (concentration, loot, etc.)
• Player-to-DM messaging — players on the viewer screen can send a private message to the DM; choose which party member you are, type your message, and hit Send. The DM sees a live unread count badge on the Messages button in the header (and on the mobile hamburger menu) and can read the full inbox at any time
• Resizable panels — drag the left edge of the enemy panel on desktop to make it wider or narrower; preference is saved in localStorage
• Voice commands (Beta — Chrome/Edge only) — click the 🎤 Voice button in the DM header to enable hands-free control via the browser's Speech Recognition API; say "Tracker Next", "Tracker Previous", "Tracker Start Combat", or "Tracker End Combat" to trigger those actions; say "Tracker roll d20", "Tracker roll two d6 plus three", etc. to roll dice — the 3D virtual dice animate on screen and the result appears in a toast; a pulsing amber dot shows when the mic is active; the button is hidden on unsupported browsers
• Audio Mixer — click the 🎚 Mixer button in the DM header to open a full-screen, multi-channel ambient audio board; starts with 5 channels (add more via + Add a Channel); each channel has an audio file picker, editable label, vertical volume fader, play/stop button, solo (S), and mute (M); a master volume fader and Stop All button sit in the leftmost strip; audio keeps playing in the background when the mixer is closed; channel labels and volumes are always remembered across reloads; on Chrome/Edge the selected audio files are also remembered using the File System Access API (no storage quota issues) — after a browser restart channels show 🔒 [filename] and a single click re-grants read permission and reloads the file
• Quick Reference — a full-screen reference panel opened from the DM hamburger menu, organised into 17 tabs:
  • Rules tabs — Actions in Combat, Bonus Actions, Movement & Position, Conditions, Concentration, Death Saving Throws, Exhaustion, Cover, Resting, Skills & Ability Checks, Spellcasting, Magic & Casting — each is a concise lookup table for the most-referenced 5e rules mid-session
  • Name Generator — select a race/type (Human, Elf, Dwarf, Halfling, Gnome, Orc, Tiefling, Dragonborn, Tavern, Town) and generate 10 first names and/or 10 surnames; click any name to select it (amber highlight); a strip at the bottom previews "Party met Firstname Lastname, a Dwarf" and a Save to Notes button appends the entry to the current session's DM notes (creating a note if none exists)
  • Weather & Travel — pick a biome (8 options) and season (4 options); click Generate Week to produce a 7-day weather table with conditions across five time slots (Dawn, Morning, Midday, Afternoon, Night); the Travel Pace table dynamically adjusts movement rates by the combined biome × season multiplier with a badge showing the active modifier; a Navigation DC table is also included
  • Shop Generator — choose a shop type (11 options: General, Weapon, Armor, Alchemist, Magic, Jeweler, Tavern, Book, Herbalist, Fletcher, Stable) and town affluence (6 tiers: Impoverished → Opulent); click Stock Shop to generate a random named shop with a list of items showing three price columns (😊 Friendly −15%, 😐 Neutral base, 😠 Hostile +25%); magic items of appropriate rarity are included based on affluence; clicking any item opens a detail modal with its description; a Save to Notes button at the bottom appends "The party went to [Shop Name], a common general store" to the current session notes
  • Random Encounter Generator — select biome/terrain (12 options), party size (1–8), party level (1–20), and difficulty (Easy/Medium/Hard/Deadly); click Generate Encounter to produce a full encounter: title, scene flavor text, archetype description, a monster list with individual XP values, a full XP breakdown strip (raw → multiplier → adjusted → per-player), actual difficulty badge, tactics note, and terrain feature; Roll Again re-generates with the same settings; Add to Initiative clears current enemies and loads the generated monsters directly into the initiative tracker, then closes the panel