Opensource tools
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laubonghaudoi - Subtitle Editor
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.

Pokémon Showdown
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.

Blaze - P2P File Sharing
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.