what is the best free light tools to view and analyze log files like fortigate, juniper cisco and others. i want offline tools

Viewing and analyzing log files from devices like FortiGate, Juniper, and Cisco can be critical for network administration and security management. Here are several free offline tools that you can use to analyze log files effectively:

### 1. **Notepad++**
   - **Description**: A powerful text editor that supports large files and provides advanced search capabilities, syntax highlighting, and plugin support.
   - **Features**: Customizable, supports various file formats, and has plugins for additional functionality.
   - **Platform**: Windows

### 2. **LogViewer**
   - **Description**: A straightforward log file viewer specifically designed for easier viewing of log files.
   - **Features**: Filters and searches logs, color-coding for easy identification of log types.
   - **Platform**: Windows

### 3. **GoAccess**
   - **Description**: A real-time web log analyzer and interactive viewer that runs in a terminal.
   - **Features**: Supports various log formats, provides a dashboard view in terminal or HTML format.
   - **Platform**: Linux; can be compiled and used on Windows with Windows Subsystem for Linux (WSL).

### 4. **Glogg**
   - **Description**: A fast, multi-platform tool that boasts a simple interface to browse and search through large log files.
   - **Features**: Supports large files without loading them entirely into memory, allows regex searches.
   - **Platform**: Windows, macOS, and Linux.

### 5. **LogExpert**
   - **Description**: A log file viewing tool that allows you to view and analyze log files with advanced filtering and coloring.
   - **Features**: Tail functionality, support for highlighting, and plugin support.
   - **Platform**: Windows

### 6. **ELK Stack (Elasticsearch, Logstash, Kibana)**
   - **Description**: Although typically used online, you can run the ELK stack locally for log aggregation and analysis.
   - **Features**: Powerful search analytics, custom dashboards, and visualizations.
   - **Platform**: Cross-platform but requires more setup.

### 7. **LogParser**
   - **Description**: A versatile tool from Microsoft that can parse and analyze various data sources, including log files.
   - **Features**: Use SQL-like queries to analyze logs, great for advanced users.
   - **Platform**: Windows

### 8. **BareTail**
   - **Description**: A free version of a real-time log file monitoring tool with real-time tail functionality.
   - **Features**: Offers highlighting, as well as a straightforward user interface for monitoring logs.
   - **Platform**: Windows

### Additional Considerations:
- Always check compatibility with the specific log formats you are working with (e.g., Syslog, CSV, custom formats).
- Some of the mentioned tools might require additional configurations to cater to specific log structures.
- For larger organizations or more complex log analysis, consider investing time into setting up an ELK stack locally, as it can handle larger volumes of logs effectively.

These tools should help you view and analyze your FortiGate, Juniper, Cisco, and other logs offline effectively.