When it comes to FPGA programming, there are several free software tools available to help you get the job done. Whether you are a beginner or an experienced user, you can find a suitable tool that fits your needs.
1. Xilinx Vivado
Xilinx Vivado is a free FPGA programming software tool from Xilinx, the largest FPGA vendor in the world. It is a comprehensive suite of tools for designing, programming, and debugging FPGAs, making it a great choice for both beginner and experienced users. It supports all Xilinx FPGAs, including the popular Artix and Spartan lines. The Vivado Design Suite includes a complete set of design, synthesis, and implementation tools, as well as several debug and verification tools. It also includes a rich library of IP cores, making it easy to add complex functions to your designs.
2. Altera Quartus Prime
Altera Quartus Prime is a free FPGA programming software tool from Intel. It supports all Altera FPGAs, including the popular Cyclone, Arria, and Stratix lines. The Quartus Prime Design Suite includes a complete set of design, synthesis, and implementation tools, as well as several debug and verification tools. It also includes a rich library of IP cores, making it easy to add complex functions to your designs.

3. Lattice Diamond
Lattice Diamond is a free FPGA programming software tool from Lattice Semiconductor. It is a comprehensive suite of tools for designing, programming, and debugging Lattice FPGAs. It supports all Lattice FPGAs, including the popular MachXO2 and ECP5 lines. The Diamond Design Suite includes a complete set of design, synthesis, and implementation tools, as well as several debug and verification tools. It also includes a rich library of IP cores, making it easy to add complex functions to your designs.
4. Xilinx ISE
Xilinx ISE is a free FPGA programming software tool from Xilinx. It is a comprehensive suite of tools for designing, programming, and debugging FPGAs. It supports all Xilinx FPGAs, including the popular Artix and Spartan lines. The ISE Design Suite includes a complete set of design, synthesis, and implementation tools, as well as several debug and verification tools. It also includes a rich library of IP cores, making it easy to add complex functions to your designs.

5. Altera Quartus II
Xilinx PlanAhead is a free FPGA programming software tool from Xilinx. It is a comprehensive suite of tools for designing, programming, and debugging FPGAs. It supports all Xilinx FPGAs, including the popular Artix and Spartan lines. The PlanAhead Design Suite includes a complete set of design, synthesis, and implementation tools, as well as several debug and verification tools. It also includes a rich library of IP cores, making it easy to add complex functions to your designs.
7. Lattice Radiant
Lattice Radiant is a free FPGA programming software tool from Lattice Semiconductor. It is a comprehensive suite of tools for designing, programming, and debugging Lattice FPGAs. It supports all Lattice FPGAs, including the popular MachXO2 and ECP5 lines. The Radiant Design Suite includes a complete set of design, synthesis, and implementation tools, as well as several debug and verification tools. It also includes a rich library of IP cores, making it easy to add complex functions to your designs.

In addition to these free software tools, there are also several commercial FPGA programming tools available. These tools are more feature-rich than the free ones, but they typically require a license fee. However, they can be a great choice for experienced users who need more advanced features.
No matter which tool you choose, it is important to make sure that it is compatible with your FPGA. Most FPGA programming software tools are specific to the vendor, so make sure you check the compatibility before downloading and installing the software. Once you have the software installed, you can start programming your FPGA and taking advantage of the powerful features it offers.