Reform Government Surveillance
The Senate can "send a strong message of change," companies said.
Evernote becomes 10th member of Reform Government Surveillance coalition.
Outside voices are increasing their calls for the Senate to overhaul the spy agency.
Facebook, Google, Microsoft and other top technology companies are warning the Senate.
Sunday is the 13th anniversary of the Patriot Act.
The threat is included in more than 1,500 pages of formerly classified papers.
Internet and technology groups were swift to congratulate senators Tuesday.
Dropbox is the latest member of the anti-NSA tech coalition.