Bit late but ik some good ones
More Romance Focused:
My Therapy (early acc) - Steam
Sepia Tears - Steam + Other
Find Love or Die (personally not exactly my thing but it is good also was free?) - Steam/itch.io
More Plot focused:
Junipers Knot - Steam
Kill or Love - Steam
Ambre - Steam
The Letter (not free but usually cheap) - Steam + other
Other Freeware (that were archived/haven't properly played):
Homeward - official website
May Sky - freeware archive
True Remembrance - freeware archive link
Narcissu 1 & 2 - Steam
Lucid 9 - Steam
Last one I'll recommend is FNIA: Golden Time. Once you look at it you'll realise why I put it last. For a harem VN it's not half bad but it is more of a 'f it why not?'.