Bleep is a free 8 bit or chiptune style VSTi synthesizer plug-in for Windows which inspired by the sound of MOS Technology SID.
Main features:

• 3 oscillators with four waveforms: sawtooth, triangle, pulse (with PW) and noise
• Each oscillator has own detuner, ADSR envelope and multimode LP/BP/HP filter
• Multimode LFO synced with BPM and with Random mode
• Modulator Envelope Generator
• Pseudo arpeggiator
• Overall multimode filter
• Adjustable degrader
• Built-in preset manager with ability to patch name editing

Watch Bleep Video Demo

Bleep is a vst instruments plugins developed by ToneBytes , a free Chiptune Synth VST plugins that you can use on any VST Compatible hosts such as Steinberg Cubase, Nuendo, Wavelab, FL Studio/Fruityloops, Ableton Live, Adobe Audition, LMMS, Reaper, SONAR, Mixcraft, Acid Pro, etc.
For more information about Bleep please visit Developer Website