Vircadia
Second Life
VRChat
Facebook Spaces
Hubs by Mozilla
OpenSimulator
Sansar
vTime XR
Markdrop
BugHerd
Pastel
Webvizio
Vircadia MarkdropMarkdrop's answer:
Markdrop combines powerful visual feedback, screen recording, and developer-ready bug reporting into a single, lightweight tool that feels invisible until you need it. Unlike bloated alternatives, Markdrop is fast, easy to integrate, and built for modern teams who care about speed and clarity with no Chrome extension or signup friction required.
Markdrop's answer:
Affordable, transparent pricing: Markdrop offers all the core features at a fraction of the cost of tools like Markup.io or Pastel.
Designed for devs and designers: Every comment can include logs, screen recordings, and environment data ready for developers to act on.
No friction for users: Share a link and anyone can leave feedback. No browser extensions, no accounts, no hassle.
Fast and privacy-respecting: Lightweight script, GDPR-compliant, and zero tracking bloat.
All-in-one: Combines comments, annotations, bug reporting, and async video so teams donโt need 3 different tools.
Markdrop's answer:
Markdrop is built for:
Founders and indie builders who want fast feedback without complex tools
Designers and PMs collecting client or stakeholder feedback
Developers who want bug reports with context, not vague screenshots
Agencies delivering websites and apps that need client review In short, itโs for lean product teams who value clarity and speed.
Markdrop's answer:
Markdrop was born out of frustration. As a solo founder building multiple products, I (Manuel) kept running into the same feedback pain, long email chains, vague bug reports, and overpriced tools that did too much or too little. So I built what I needed: a clean, no-fuss tool to drop comments directly on a site, see what users saw, and get back to shipping.
Markdrop's answer:
Which are the primary technologies used for building your product?
Frontend: Svelte 5 Backend: Cloudflare Workers, D1, and Durable Objects Database: Wrangler DB (D1) DevOps/Infra: Cloudflare Pages + R2 for static assets and file storage
Markdrop's answer:
Indie founders using Markdrop to launch and iterate faster
Agencies working with clients.
YC applicants using it to get fast design review
No-code builders collecting client feedback inside Webflow
Internal product teams replacing Slack screenshots with structured feedback
Most of the 3D world experiences limit what a user can build and do. This is not so with Vircadia. The Apache license makes this 3D application the most flexible tool for building custom and interactive worlds. Vircadia is truly free, open and relatively easy to use. There are several developers who are working and improving this platform daily! Free content ensures that new users have access to materials for building their world without having to worry about learning difficult 3D applications. I highly recommend Vircadia and believe this will be the next big server technology on the world wide web.
Probably the best open-source metaverse
Based on our record, Vircadia seems to be more popular. It has been mentiond 19 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Vircadia is an open source (Apache 2.0) metaverse ecosystem consisting of a high performance real-time server architecture (C++), web SDK (TS), and web client (TS). Source: over 2 years ago
Not pre-baked. I work on https://vircadia.com/ -- it has to give every user their own audio mix to account for their 3D position. This means codec costs add up fast. You can't just encode once and stream the same thing to a dozen people. - Source: Hacker News / over 4 years ago
Both, primarily the first. Low latency is definitely a requirement, but no issues with Opus on that account. > I haven't looked into how expensive it is to encode in terms of CPU time, so I assume maybe you're taking about a bottleneck in terms of the number of simultaneous streams you can support on a single CPU? Yup! I work on https://vircadia.com/ -- we have to compress audio in real time and every user gets... - Source: Hacker News / over 4 years ago
Second Life improved avatars by quite a lot in fairly recent times. There's also alternatives to it, eg, check out the project I work on: https://vircadia.com/ It's a sort of spiritual successor to Second Life, since it was started by the same guy -- Philip Rosedale -- after he left SL. It didn't quite work, so the commercial project died and got picked up by open source forks, which is what I work on. It's less... - Source: Hacker News / over 4 years ago
To me it's useful/entertaining in the ways forums and chats are, plus some additional features on top of that. Eg, you can talk to people, but in addition to that you have a collaborative 3D environment with positional audio where you can script, make games or do other stuff. Recently a group using our project put up a Christmas Carol VR play, and the results were most impressive. https://vircadia.com/ -- it's an... - Source: Hacker News / over 4 years ago
Second Life - Second Life is a virtual reality platform where individuals interact in a virtual world. The software was developed in 2003 by Linden Labs. More than one million people now regularly use the software.
BugHerd - BugHerd: The Website Feedback Tool for Agencies
VRChat - Create and play in virtual worlds with others
Pastel - Sticky note-based feedback collection tool for live websites
Facebook Spaces - Facebook's social Virtual Reality platform is here!
Webvizio - This free website feedback tool & website review software allows managers and teams to collaborate on website revisions in real time. Join for free now!