Since everything (at least by default) through F-Droid is FOSS, there is a significant lack of ads and other misfeatures. Apps that depend on an account with a non-free third-party service are clearly marked as such. Most apps aren't foolishly tied at the hip to Google Play Services. Malware is non-existent.
For those interested in taking a shot at using these services, here are a couple of the more credible ones I've run into in the last couple years (I haven't used them in at least 6 months, so possibly their status has changed). Use at your own risk!:
- APK Downloader: By someone on XDA-forums, a leading Android dev community. It comes in several versions and forks by other XDA members, and for several platforms. I don't have time to sort them out now, sorry. Beware of malware-infected hosted implementations.
http://codekiem.com/2014/08/07/official-apk-downloader-v2-do... / http://forum.xda-developers.com/showthread.php?t=1515021
http://forum.xda-developers.com/showthread.php?t=1809458
https://github.com/Lekensteyn/apk-downloader
- Racoon: Desktop OS client for Play Store (along with its Github and XDA links)
http://raccoon.onyxbits.de / https://github.com/onyxbits/Raccoon / https://forum.xda-developers.com/showthread.php?t=2772436
For those who want to know more; here's what I found:
https://github.com/yeriomin/YalpStore - The readme is a great place to start.
On F-Droid: https://f-droid.org/packages/com.github.yeriomin.yalpstore/
EDIT: It looks great!
How do you know? Why do you trust it?