serverlist.lgms.nl/#downloadMods
The mod pack downloader
From this website you can download all popular mods in one zip file. It collects popular mods (played by 2 or more players) per game version so that you get the mods that are popular for (and definitely work with) your game version. It tracks 24/7, updates the mod pack every hour and calculates popularity over the past 7 days.
The mod pack gets big quickly, for the latest Factorio version it's more than a gigabyte. Therefore there is an option to limit the size of the mod pack. This uses an algorithm which gets you the most bang for the buck: it divides every mod's popularity score by its size, and the ones with the highest score (most popularity per megabyte) get added first. This means that in a mod pack of 100MB, it will not add a 90MB mod if there are 50 other mods of 150KB that are nearly as popular.
Let me know what you think and how it can be made even more useful!
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Note: this tool is integrated with the unofficial Factorio serverlist. See this topic for the Factorio serverlist.