NaLex is an independent audio software developer that creates free guitar and bass amp simulator plugins for VST and AU hosts. The project distributes its plugins as direct downloads, and the catalog focuses on circuit-modeled tube amplifier emulations rather than convolution or profile-based approaches. Plugins are typically Windows-native but are noted as compatible with Linux and macOS through Wine.

The lineup centers on Amplex, a multiamp plugin whose preamp and power-amp sections can be reshaped via user-loadable text presets to approximate the tone of various classic amps, and TrueSim, a more flexible circuit-modeling amp sim with companion app TrueSimCircuit for building custom signal paths. Other releases include the high-gain Ninja, the Friedman-style Crunchman, the Bogner-Uberschall-inspired Uber, the Pectifier (a high-gain head emulation), the J800 (a Marshall JCM800-style preamp), a Bass plugin modeled on the Ampeg SVT-CL, and IRbis, a cabinet impulse-response loader with mixing and series/parallel routing.

Alongside the amp sims, NaLex maintains a small set of utility programs including Oksid (a SID chiptune player), SigmaCalc, FilesComparator, SerialMonitor, and a CapMeter Arduino sketch. The plugins have built up a following on community sites such as KVR Audio and SevenString.org, where users share preset packs and tone matches.

NaLex has 3 products cataloged on Equipboard, including Amp Simulator Plugins.