NetScream 1.2.26.2007 
818 KB, shareware, rate:  
NetScream - Makes direct changes to system registry and system files to enhance internet download and upload speeds
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Modem Spy 3.4.1 
248 KB, demo, rate:  
Modem spy is handy tool for phone calls recording
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Virtual Null Modem 2.0.5 build 27 
1.62 MB, shareware, rate:  
Virtual Null Modem is an utility, which purpose is to emulate one or more RS232 serial ports connected via virtual null-modem cable
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Moony 3.15 
2.87 MB, shareware, rate:  
Moony is an ISDN call monitor program. It's basic purpose is to show the phone number (and names) for incoming calls. Other highlights are telephone answering machine, fax (send and receive), SMS notification, speech output and network support
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SC Net Speed Booster 4.0.0.1 
4.36 MB, freeware, rate:  
Net Speed Booster is a utility to help you keep your system healthy and responsive
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SC Net Speeder Lite 4.0.0.0 
3.43 MB, freeware, rate:  
SC Net Speeder Lite - speed up your modem, Cable, DSL and ISDN (LAN connection) speed SC Net Speeder will try for you those settings to give you the most appropriate settings for your own system
more info screenshot