Yes, I'm using Diffzilla. My version is:
SlickEdit 2013 (v18.0.1.1 64-bit)
Serial number: WB944898
Licensed number of users: Single user
License file: C:\ProgramData\slickedit\18\slickedit.lic
Build Date: August 08, 2013
Emulation: CUA
OS: Windows 7 x64
OS Version: 6.01.7601 Service Pack 1
Memory: 39% Load, 3255MB/8149MB Physical, 3303MB/16296MB Page File, 561MB/8388607MB Virtual
Shell Info: C:\Windows\system32\cmd.exe /q
Screen Size: 1280 x 1024, 1280 x 1024
Project Type: Verilog: Model Technology ModelSim
Language: .sv (SystemVerilog)
Installation Directory: C:\Program Files\SlickEditV18.0.1 x64\ (non-removable drive,NTFS,141970MB free)
Configuration Directory: C:\Users\dfechser\Documents\My SlickEdit Config\18.0.1\ (non-removable drive,NTFS,141970MB free)
Spill File: c:\Users\dfechser\Documents\Tools\SlickEdit\Spillfile\$slk.11 (non-removable drive,NTFS,141970MB free)
Thanks,
Dave F.