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Top 15 C++ Bittorrent Projects
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aria2
aria2 is a lightweight multi-protocol & multi-source, cross platform download utility operated in command-line. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink.
I like using the aria2[0] download utility - I don't think I've downloaded anything bigger than a dozen megabytes through a web browser for the last several years, and this method allows me more protocols, multiple connections, and of course continuing downloads. That said, it's nice someone found a solution to the problem - makes life easier for everyone who doesn't use an external download utility.
[0]: https://aria2.github.io/
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AppSignal
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Project mention: Deep Dive: How qBittorrent 4.6's Sequential Download Works vs. Transmission 4.0's Peer Selection | dev.to | 2026-04-30
Methodology: All benchmarks run on an Intel i7-13700K (16 cores/24 threads), 32GB DDR4-3200 RAM, 2TB Samsung 980 Pro NVMe SSD, 1Gbps symmetric fiber connection. OS: Ubuntu 22.04 LTS (kernel 5.15.0-91-generic). Client versions: qBittorrent 4.6.0 (commit a1b2c3d), Transmission 4.0.4 (commit x7y8z9a). Test duration: 90 days, 12,000+ torrent swarms across public (The Pirate Bay, 1337x) and private (PassThePopcorn, BroadcastTheNet) trackers.
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Project mention: Peerweb: Decentralized website hosting via WebTorrent | news.ycombinator.com | 2026-01-30
been waiting for this for a while https://github.com/transmission/transmission/issues/47 https://github.com/arvidn/libtorrent/issues/7283
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Project mention: A ncurses-based command line torrent client for high performance | news.ycombinator.com | 2025-11-23
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Project mention: Mounting tar archives as a filesystem in WebAssembly | news.ycombinator.com | 2026-04-24
Now I want to try how does that work with BTFS which in a similar vein mounts a torrent file or magnet link as a read only directory https://github.com/johang/btfs
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SaaSHub
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rats-search
rats-search: BitTorrent P2P multi-platform search engine for Desktop and Web servers with integrated torrent client
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C++ Bittorrent discussion
C++ Bittorrent related posts
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Making big downloads resumable in Firefox
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Aria2 The next generation download utility
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Deep Dive: How qBittorrent 4.6's Sequential Download Works vs. Transmission 4.0's Peer Selection
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Cecot – 60 Minutes
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Windows Memory Mapped File IO
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RCE Vulnerability in QBittorrent
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QBittorrent: Open-Source, Lightweight, and Feature-Rich BitTorrent Client
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A note from our sponsor - SaaSHub
www.saashub.com | 13 Oct 2026
Index
What are some of the best open-source Bittorrent projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | aria2 | 42,996 |
| 2 | qBittorrent | 40,732 |
| 3 | qBittorrent-Enhanced-Edition | 26,754 |
| 4 | libtorrent | 6,086 |
| 5 | rtorrent | 4,872 |
| 6 | btfs | 3,974 |
| 7 | picotorrent | 2,754 |
| 8 | rats-search | 2,020 |
| 9 | libutp | 1,154 |
| 10 | vlc-bittorrent | 503 |
| 11 | libtorrent4j | 285 |
| 12 | porla | 279 |
| 13 | openwebtorrent-tracker | 77 |
| 14 | Envy | 51 |
| 15 | server | 50 |
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