Mark Studio 2 hasn't received a fair shake in this thread. It is (IMO) the most versatile and best sounding bass amp sim available! Like a lot of these plugins, the presets are not a one size fits all, so you have to tweak. That being said, I have gotten monster results with it.
Download free Bass VST,VSTi,AU,RTAS music software plugins & Instruments.
But why should you use a bass plugin. Given the success of bass plug-ins, it shouldn’t be surprising that the market is swarmed with bass VST plugins.
Included Effect Plug-ins. Analyzer Plug-ins. Delay Plug-ins; Distortion Plug-ins. AmpSimulator is a distortion effect that emulates the sound of various types of guitar amp and speaker cabinet combinations. A wide selection of amp and cabinet models is available. If you are into lo-fi sound, BitCrusher is the effect.

VST Bass Amp is a bass amp simulator. It offers a choice of amplifiers and speaker cabinets that can be combined with stomp box effects.

At the top of the plug-in panel, the following buttons open different pages in the display section of the plug-in panel: Pre-Effects, Amplifiers, Cabinets, Post-Effects, Microphones, Configuration, and Master.

Bass Enhancer VST plugin summary: For the paid 64bit Bass Enhancer VSTs we have: Maxxbass/Renaissance Bass - enhance bass through upper harmonics to psychologically alter the listeners perception of bass. LF Max Punch - enhance bass through subharmonics, targeting contemporary music. Lowennder - also uses subharmonics, and appliess a gating.

These buttons are arranged according to the position of the corresponding elements in the signal chain.

Below the display section, the selected bass amplifier is displayed. The color and texture of the area below the bass amp indicate the selected cabinet.

Pre/Post-Effects

On the Pre-Effects and Post-Effects pages, you can select up to six common bass effects. On both pages, the same effects are available, the only difference being the position in the signal chain (before or after the bass amplifier). On each page, every effect can be used once.

Each effect features an On/Off button known from stompbox effects, as well as individual parameters.

Wah Wah

Pedal – Controls the filter frequency sweep.

Envelope Filter

Range – Determines the frequency range.

Q-Factor – Sets the intensity of the envelope filter effect.

Sensitivity – Determines how sensitive the effect reacts to the instrument level.

Attack – Determines how quickly an effect reacts to the input signal.

Mix – Sets the level balance between the dry signal and the wet signal.

Type – Sets the filter type.

Release – Determines how quickly the effect fades after the input signal stops.

Volume

Pedal – Controls the level of the signal passing through the effect.

Compressor

Intensity – Sets the amount by which an input signal is being compressed.

Compressor MB

Lo Intensity – Sets the compressor effect in the low frequency band. Activate/deactivate Auto Makeup Mode by clicking the LED at the top right of the knob.

Hi Intensity – Sets the compressor effect in the high frequency band. Activate/deactivate Auto Makeup Mode by clicking the LED at the top right of the knob.

Crossover – Determines the crossover frequency between the low frequency band and the high frequency band.

Output – Sets the output level.

Limiter

Threshold – Determines the maximum output level. Signal levels above the set threshold are cut off.

Release – Sets the time after which the gain returns to the original level.

Maximizer

Amount – Determines the loudness of the signal.

Chorus

Rate – Allows you to set the sweep rate. This parameter can be synchronized to the project tempo.

Width – Determines the depth of the chorus effect. Higher settings produce a more pronounced effect.

Tone – Allows you to attenuate low frequencies.

Mix – Sets the level balance between the dry signal and the wet signal.

Phaser

Rate – Allows you to set the sweep rate. This parameter can be synchronized to the project tempo.

Width – Determines the width of the modulation effect between higher and lower frequencies.

Tone – Allows you to attenuate the low frequencies.

Mix – Sets the level balance between the dry signal and the wet signal.

Flanger

Rate – Allows you to set the sweep rate. This parameter can be synchronized to the project tempo.

Feedback – Determines the character of the flanger effect. Higher settings produce a more metallic sounding sweep.

Tone – Allows you to attenuate the low frequencies.

Mix – Sets the level balance between the dry signal and the wet signal.

DI Driver

Level – Sets the output level.

Blend – Blends between normal and tube emulation circuitry. With Blend at 0, Drive and Presence are not active.

Bass – Boosts or attenuates low frequencies.

Treble – Boosts or attenuates high frequencies.

Presence – Boosts or attenuates upper harmonics and attacks.

Drive – Sets gain and overdrive.

Enhancer

Enhance – Simulates the classic enhancer effect.

Tone – Allows you to attenuate low frequencies.

Octaver

Direct – Adjusts the level of the original signal. A value of 0 means only the generated and transposed signal is heard. By raising this value, more of the original signal is heard.

Octave 1 – Adjusts the level of the signal that is generated one octave below the original pitch. A setting of 0 means that the voice is muted.

Tone – Changes the sound character of the generated signal.

Delay

Delay – Sets the delay time in milliseconds. This parameter can be synchronized to the project tempo.

Feedback – The higher this setting, the more delay repeats are created.

Mix – Sets the level balance between the dry signal and the wet signal.

Tape Ducking Delay

Delay – The Delay parameter sets the delay time in milliseconds.

Feedback – The higher this setting, the more delay repeats are created.

Duck – Works like an automatic mix parameter. If the level of the input signal is high, the portion of the effect signal is lowered, or ducked (low internal mix value). If the level of the input signal is low, the portion of the effect signal is raised (high internal mix value). This way the delayed signal stays rather dry during loud or intensely played passages.

Tone – Allows you to attenuate the low frequencies.

Mix – Sets the level balance between the dry signal and the wet signal.

Overdrive

Drive – Overdrive creates a tube-like overdrive effect. The higher this value, the more harmonics are added to the output signal of this effect.

Tone – Works as a filter effect on the added harmonics.

Level Exotic instruments vst free. – Adjusts the output level.

Magneto II

Drive – Controls the amount of tape saturation.

Low/High – These parameters set the frequency range of the spectrum band to which the tape effect is applied.

HF-Adjust – Sets the amount of high frequency content of the saturated signal.

Gate

Threshold – Determines the level at which the gate is activated. Signal levels above the set threshold open the gate and signal levels below the set threshold close the gate.

Release – Sets the time after which the gate closes.

Equalizer

Low – Changes the level of the low-frequency portion of the incoming signal.

Middle – Changes the level of the mid-frequency portion of the incoming signal.

High – Changes the l

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