I used to use Viewmate from Lavenir several years back . It is now offered by Pentalogix. I haven't used it recently but it used to allow me to view Gerbers and get dimension and aperture information. The free version didn't allow to edit Gerbers though.

Tom

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Peter Wong
Sent: Wednesday, January 10, 2018 2:05 PM
To: [log in to unmask]
Subject: EXTERNAL: Re: [TN] got Free gerber viewers?

Hi Doug,

We’ve been using GC Preview forever but we just found out that now they are charging $50.00 / user /year for it.

Peter

From: Douglas Pauls [mailto:[log in to unmask]]
Sent: Wednesday, January 10, 2018 10:57 AM
To: TechNet E-Mail Forum; Peter Wong
Subject: Re: [TN] got Free gerber viewers?

GC Preview from Graphicode


Doug Pauls
Principal Materials and Process Engineer Rockwell Collins

On Wed, Jan 10, 2018 at 12:37 PM, Peter Wong <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Hi everyone,

I'm looking for recommendations for free gerber viewers.

Thanks
Peter

________________________________
The enclosed documents are proprietary items to Silicon Forest Electronics' (SFE) customers. They shall not be reproduced nor disclosed for any purpose except as specified in writing from an authorized agent of SFE. These documents may contain data restricted for export by the International Traffic in Arms Regulations (ITAR) section of the Arms Export Control Act (or the Export Administration Act). Violators are subject to severe criminal penalties.
This e-mail, and any file attached to it, is meant only for the intended recipient of the transmission and may be a communication privileged by law. If you have received it in error, please notify the sender immediately and delete the original from your system. Any other use of this e-mail by you is strictly forbidden.