- Supports FTP
- Supports HTTP including redirection.
- Proxy servers supported.
- Resume Supported.
- Improved error checking and correction.
- Complete acceleration: The file will be downloaded as fast as possible as your more…
- Now the downloads are ALL to a SINGLE file. There is no downloading to individual files as was done previously.
- Multiple server based downlaoding is supported based on ftpsearch and ping results obtaines for a URL prozilla will attempt to make multiple connections to different servers and try to speed up the download even more.
Intel, Mac OS X 10.6 or later
Download: prozilla-macosx-snowleopard
Later edit (2025) – from ProZilla to aria2
Over time I stopped recommending ProZilla, because the project is unmaintained and outdated, which can lead to security issues on modern systems. As a replacement, I now use aria2, an actively maintained command‑line download tool that supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink, and can download from multiple sources in parallel.
Installing aria2 on macOS (Homebrew)
This assumes you already have Homebrew installed; if not, follow the instructions on the Homebrew website first.
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Open Terminal.
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Install aria2 with:
brew install aria2
After that, the main binary aria2c is available in your PATH and ready to use.
Basic aria2 usage
Some simple examples that cover the typical “download accelerator” use case:
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Straightforward HTTP/HTTPS download:
aria2c https://example.com/file.iso
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Download with multiple connections to maximize throughput:
aria2c -x16 -s16 https://example.com/file.iso
Where:
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-x16sets up to 16 concurrent connections to the server. -
-s16splits the file into 16 segments. -
Resume an interrupted download (if the server supports it):
aria2c -c https://example.com/file.iso
The -c option tells aria2 to continue an existing file instead of restarting it.
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Download multiple URLs listed in a text file:
aria2c -i urls.txt
Each line in urls.txt is treated as a separate download.
Minimal recommended configuration
You can create a config file, for example ~/.aria2/aria2.conf, to store your preferred defaults.
Example:
max-concurrent-downloads=4
split=16
min-split-size=1M
continue=true
dir=/Users/USERNAME/Downloads
With that in place you can simply run:
aria2c https://example.com/file.iso
aria2 also supports BitTorrent, Metalink, a JSON‑RPC interface and daemon mode, but for a modern, safer replacement of ProZilla as a general download accelerator, the commands above are usually all you need.
