Blaze is a browser-based, peer-to-peer file-sharing app that lets you transfer files between devices over the Internet without needing to install anything or make an account. You join a “room” in your browser (with a nickname), and using WebRTC / WebTorrent (or WebSockets as a fallback), you can send files directly to others in that room. Everything happens live, files aren't stored on a server, and it works across different networks and devices.

Pokémon Showdown is a web-based Pokémon battle simulator where you can build custom teams or use randomly generated ones and fight against other players. It supports a wide variety of battle formats (competitive tiers, random battles, special formats) and lets you share replays, chat, and test strategies in a fast, animated simulator.

Subtitle- Editor.org is a free, browser-based tool for editing subtitle files like .srt and .vtt. You can load your subtitles (and a media file if you like), edit text or timing, split or merge lines, and drag waveforms to sync timestamps. You can then save your work in several formats.