All the events available in Magento
List of global events
adminhtml_controller_action_predispatch_start admin_user_authenticate_after controller_front_init_routers store_save_commit_after store_group_save_commit_after website_save_commit_after store_delete_commit_after store_group_delete_commit_after website_delete_commit_after core_config_data_save_commit_after log_log_clean_after prepare_catalog_product_price_index_table catalog_product_type_configurable_price sales_order_save_before catalog_product_load_after catalog_product_clear catalog_product_collection_load_after catalog_product_prepare_index_select sales_quote_item_collection_products_after_load sales_quote_item_qty_set_after checkout_submit_all_after sales_model_service_quote_submit_before sales_model_service_quote_submit_success sales_model_service_quote_submit_failure sales_order_item_cancel sales_order_creditmemo_save_after catalog_product_save_after catalog_model_product_duplicate admin_system_config_changed_section_cataloginventory prepare_catalog_product_index_select end_index_events_cataloginventory_stock_item_save end_process_event_cataloginventory_stock_item_save sales_order_place_after sales_quote_config_get_product_attributes sales_convert_quote_address_to_order sales_order_save_after catalogindex_prepare_price_select sales_quote_collect_totals_before checkout_cart_update_items_before checkout_cart_add_product_complete catalogindex_plain_reindex_after sales_convert_quote_to_order catalog_entity_attribute_save_before catalogrule_after_apply catalog_product_view_config bundle_product_view_config websiterestriction_frontend smtppro_email_after_send payment_info_block_prepare_specific_information sales_order_load_after sales_order_payment_cancel controller_action_layout_render_before</pre> <h2>List of adminhtml events<!--more--></h2> <pre>cms_wysiwyg_config_prepare controller_action_predispatch_adminhtml show_synchronize_message controller_action_predispatch core_locale_set_locale admin_system_config_changed_section_admin cms_wysiwyg_images_static_urls_allowed catalog_product_get_final_price catalog_product_save_after catalog_product_import_finish_before catalog_product_import_after catalog_entity_attribute_delete_after catalog_entity_attribute_save_after catalog_product_delete_before catalogrule_before_apply catalogrule_after_apply catalog_product_status_update catalog_product_edit_form_render_recurring payment_method_is_active customer_save_after after_reindex_process_cataloginventory_stock sales_order_shipment_track_save_after sales_order_shipment_save_after catalog_product_delete_after_done catalog_controller_product_save_visibility_changed catalog_controller_product_delete sales_convert_quote_item_to_order_item sales_convert_quote_address_to_order sales_convert_quote_to_order adminhtml_sales_order_create_create_order sales_convert_order_to_quote sales_convert_order_item_to_quote_item checkout_submit_all_after catalog_product_prepare_save catalog_model_product_duplicate catalog_product_edit_action catalog_product_new_action payment_info_block_prepare_specific_information sales_order_item_save_commit_after sales_order_save_commit_after adminhtml_catalog_product_edit_prepare_form adminhtml_catalog_product_form_prepare_excluded_field_list adminhtml_product_attribute_types adminhtml_catalog_product_edit_element_types customer_delete_after core_config_data_save_after before_save_message_queue core_block_abstract_to_html_before adminhtml_cms_page_edit_tab_meta_prepare_form</pre> <h2>List of frontend events</h2> <pre>controller_action_noroute controller_action_nocookies controller_action_layout_load_before customer_login customer_logout sales_convert_quote_item_to_order_item catalog_product_get_final_price prepare_catalog_product_collection_prices catalog_product_type_prepare_cart_options sales_quote_collect_totals_after sales_quote_save_after checkout_submit_all_after controller_action_postdispatch_checkout_onepage_saveOrder controller_action_predispatch controller_action_postdispatch checkout_quote_destroy review_save_after tag_tag_product_collection_load_after catalog_block_product_list_collection catalog_product_compare_remove_product catalog_controller_product_view sendfriend_product catalog_product_compare_add_product catalog_product_compare_item_collection_clear sales_quote_item_save_before wishlist_add_product wishlist_share checkout_onepage_controller_success_action checkout_multishipping_controller_success_action googlecheckout_block_link_html_before sales_convert_quote_address_to_order sales_convert_quote_to_order checkout_controller_onepage_save_shipping_method checkout_controller_multishipping_shipping_post sales_convert_order_to_quote sales_order_item_save_after catalog_product_upsell catalog_product_collection_load_after payment_form_block_to_html_before sales_order_item_save_commit_after sales_order_save_commit_after checkout_type_onepage_save_order_after checkout_type_multishipping_create_orders_single checkout_allow_guest controller_front_send_response_after controller_action_predispatch_customer_account_loginPost controller_action_predispatch_customer_account_createpost controller_action_layout_generate_blocks_after customer_customer_authenticated controller_action_predispatch_persistent_index_unsetCookie controller_action_postdispatch_persistent_index_unsetCookie sales_quote_save_before custom_quote_process controller_action_postdispatch_checkout_onepage_saveBilling customer_register_success controller_action_predispatch_paypal_express_start controller_action_predispatch_googlecheckout_redirect_checkout controller_action_predispatch_checkout_multishipping_index render_block update_customer_cookies customer_save_after customer_delete_after core_block_abstract_to_html_after checkout_type_onepage_save_order controller_action_predispatch_onestepcheckout_index_index controller_action_predispatch_checkout_onepage_index controller_action_predispatch_checkout_onepage_success core_layout_update_updates_get_after controller_action_predispatch_checkout_multishipping_success controller_action_predispatch_checkout_multishipping_index_index
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Thank you very much for your sharing.
Which is class where I can find the event sales_quote_item_save_before
You can find this in Mage_Sales_Model_Quote_Item under _beforeSave function which will take you to _beforeSave function in Mage_Sales_Model_Quote_Item_Abstract class which further will take you to _beforeSave function in Mage_Core_Model_Abstract class.
Hope the above information helps!