1)   RascalPro 1.9
RascalPro enhances your dial-up session management and keeps your connection alive by simulating network activity and restoring the connection if it is lost. Other features include session scheduling, batch processing, file logging and time tracking.

 2)   Repeat Dialer 3.52.1
If a number is busy, this program will recheck that number repeatedly for availability. You'll hear a ring signal when the line becomes free. You can redial on ring signals too. This is useful for radio contests and call-in television show voting.