Internet Download Accelerator 

Easy-to-use and effective download manager that can increase download speeds by up to 500 percent. It uses intellectual multi-section download to provide the best possible performance for all connection types. IDA resumes broken downloads.
download manager resume get ftp http https proxy connections scheduler

GetBar 

GetBar lets you to noticeably increase the speed of file download from the Internet using HTTP and FTP protocols. GetBar resumes broken downloads from where they left off from HTTP and FTP servers. With GetBar you can manage download speed.
download manager resume get ftp http connections