Good non-anime related VNs?

This.

Aviary Attorney!

http://store.steampowered.com/app/429940 short, free n decent

Cinders
store.steampowered.com/app/293680/

Life is Strange, Telltale games, and Cory in the House for the Nintendo DS

I've played a bunch of VN's, and I hate how sexual most of the popular ones are >~< I personally stand by Clannad being my favourite VN with practically no sexual bits (implied sex late game, but you gotta get a baby somehow XD nothing is shown, just it's says it happened). The game is mostly a Romantic comedy tragedy.

If you wana give it a go, here's the link ^_^ http://store.steampowered.com/app/324160/

Just be warned, this game loves to rip out your heart and tear it into many pieces multiple times as you bawl your eyes out ^_^" it's quite relentless in that.

Leviathan: The Last Day of the Decade

if you like CYOA there's also some variations e.g Choice of Games (bare text) , Tin Man Ganes (more RPG-ish)

I know you said no 'anime' but if you haven't tried these yet I recommend them:

Analogue: A Hate Story

Free:
CUPID
Everlasting Summer <-It may look like a dating sim, but imo it's got some parts that make it better than a generic one + good music/art admittedly it's still a little fanservicey, but it's got a hidden horror route that makes up for it :]

I think these could be potentially good but I haven't tried them: Serafina's Crown, Black Closet , and Quantum Suicide (GL) , Omni Link (GL)

Then there's the hybrids with gameplay mixed in like
Papers Please
VA-11 Hall-A: Cyberpunk Bartender Action (haven't played it yet but should be good)
S.O.R.S (maybe not so much but some choices affect some levels).

Not sure what exactly you mean by anime vn's, not related to anime's at all, or not in an anime style, but katawa shoujo comes to mind
Edit: here a recommended list by someone on a vn forum

http://store.steampowered.com/app/384630/ :3

Not sure what you mean by non-anime related, but here are some suggestions, I haven't seen mentioned:
An Octave Higher If you go for the "true" ending it becomes serious and dramatic.
Magical Diary: Horse Hall funny one, mostly for female gamers, but have some male friends who enjoyed it too. From the same maker as Long Live the Queen

What's your request, exactly? I think you're asking for Visual Novels without over-sexualized female characters, am I right?
If so, apart from all the previous suggestion, you should also take a look at these:

• Danganronpa series, murder mistery Visual Novels with an interesting minigame;
• planetarian, if you don't mind about crying a lot;
• Higurashi series (and Umineko), horror/mistery Sound Novels;
• fault series, sci-fi Kinetic Novels set in a magical world;
• Root Double -Before Crime * After Days-, the struggles of a rescue squad trying to escape alive from a nuclear meltdown;
• WORLD END ECONOMiCA series, sci-fi economic thrillers set on the Moon.

Of course, these are all anime-style Visual Novels, but they're some of the best ones, as it could be easily imagined by the price tags.
Besides, the Visual Novel genre is strongly tied to anime-style graphics, it's really rare to see one that isn't.
For future reference, the things you're trying to avoid are best called "Weeaboo trash fodder".

Winter Voices. Not a visual novel per say but very much like one, plus turn-based battle elements. The story is good. There's a free demo of the first chapter.

You might like the Muv-Luv series, but you'd have to read them all three to get the full impact of the story which is an investment. The last part comes out sometime this Winter.. supposedly.

I think there is still fanservice here and there (if that bothers you), but it's not on the levels of the Sakura games you seem to want to avoid.