two by two

It allows for two-way synchronization between Google and Outlook calendar.

DirDiff started as a tool to check two copies of files in separate directories

SWAPNAME swaps the name of two files.

MRingModulator performs standard ring-modulation effect using two oscillators.

The SPF two-way firewall keeps hackers out and your private info inside.

It has two high-quality multi-mode filters and an interactive filter display.

It has two high-quality multi-mode filters and an interactive filter display.

A small and fast two-pane file manager with open plugin architecture.

A tool whcih synchronises two folders and all subfolders within

STDU Converter can Convert DjVu, CBR, CBZ or TIFF to PDF by two clicks.