I like https://www.wikiloc.com/ I believe the trail link is more commercial. Also just using Google with search terms (name of local town) conservation land trails to some good options.
http://www.weston.org/489/Weston-Trail-Maps
http://www.lincolnconservation.org/PDFTrailMaps.html

Correction. I was thinking of a different online trail system. Trail Link looks good.

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